Please help me with this bible verse?

The term "generation" here does not mean what we commonly mean by the word generation, as when we speak of "Generation X", or the "Baby Boomer Generation", as in the phrase "talkin' about my generation." The word generation is the word "genea", and it means primarily an offspring or a race or a line of descent, and is here used in reference to the rebellious Jews, and particularly their religious leaders, who were in a perpetual state of rebellion against God. It is the generation, or class of people who are perpetually hostile in mind and conduct towards God and His prophets. If you read the Old Testament Prophets this is the continual theme throughout. They were continually being warned by God and yet were always going astray. This is why Jesus said this to the Jews, quoting the Prophet Isaiah, who lived 700 years earlier:

"He replied, “Isaiah was right when he prophesied about you hypocrites; as it is written:

“‘These people honor me with their lips,

but their hearts are far from me.

They worship me in vain;

their teachings are merely human rules.' " "

Mark 7:6-7

For examples of how this word generation is used, see......

http://www.biblegateway.com/passage/?search=prover...

then compare these verses also in other translations.

In the context of the text, Jesus was speaking of the generation that he was talking to at the time. They would be held responsible for the persecution of all the prophets God ever sent from the beginning of time to the present. Which was completely unfair and totally unreasonable.

I suspect that this was done to make it look as if the Diaspora (70 AD) was a punishment from God, rather than the Romans.

God was not aware of the concept of only holding the individual accountable for his crimes. God has in many cases punished sons for the crimes of the father even for seven generations.

According to the Bible, we are still being punished for the sins of Adam and Eve.

In the bronze age, the sense of morality, crime and punishment was not as evolved. The old testament God was a ruthless dictator who killed women children, guilty and innocent alike. This was how gods were viewed in the bronze age.

By contrast, by the new testament times, new ideas of fairness were beginning to take hold. The code of Hammurabi had somewhat revolutionized justice, even though it was extremely unfair by our standards.

Look at the difference between Jesus' teaching and old testament justice in Leviticus 20:4-27

All the services in this sanctuary pointed to Jesus Christ, How ever the did like our time reject The Lord They wanted a person to save them from The Romans not to save from there sins, There is SO much light that man now is without excuse. You talked about Cain in Genesis 4:8-11 Abel was right with The Lord He did what He was asked because He had a saving relationship with The Lord, However Cain wanted to do things His own way, make his own path, his own righteousness if you will. God was giving A way that mankind could still be saved however There are those who because they hate The Lord also will hate those to follow Him, in Hebrews 11:4 By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh. Abel was doing what The Lord asked and Cain was doing what He wanted to do, trying to seek His own way to righteousness, The Lord was and is the one which all the scripture points, in fact The Old testament points towards the cross The New testament points back to it, "This generation" has so much light that there can be no excuses, yes things did happen before but we are accountable because we have such great light from scripture, the ones He was talking to was fixing to put Jesus on the cross because like Cain what The Lord was saying was not acceptable to them, and we who hold to the teaching of Jesus Christ without taking any verses out of scripture and keep what The Lord says will go through the same things notice what The Lord Himself said in Mark 13:11 But when they shall lead [you], and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost.

13:12 Now the brother shall betray the brother to death, and the father the son; and children shall rise up against [their] parents, and shall cause them to be put to death.

13:13 And ye shall be hated of all [men] for my name's sake: but he that shall endure unto the end, the same shall be saved.

Also notice in Luke 21:17 And ye shall be hated of all [men] for my name's sake.

21:18 But there shall not an hair of your head perish.

Now we may die the first death but the second death [see Revelations 20:14, 21:8 the Effects of hell is forever not the fire itself] those who love The Lord enough to Do what He says {John 14:15} will not perish. Find out more free bible lessons www.vop.com no bible? www.bibleuniverse.com

Jesus reveals that they consent to the murder of the prophets, and he warns: “‘The blood of all the prophets spilled from the founding of the world [will] be required from this generation, from the blood of Abel down to the blood of Zechariah, who was slain between the altar and the house.’ Yes, I tell you, it will be required from this generation.”

The world of redeemable mankind had its start with the birth of children to Adam and Eve; thus, Abel lived at “the founding of the world.” Following the vicious murder of Zechariah, a Syrian force despoiled Judah. But Jesus foretells a worse despoiling of his own generation because of its greater wickedness. This despoiling occurs about 38 years later, in 70 C.E.

Also, this might be helpful

Son of High Priest Jehoiada. After Jehoiada’s death, King Jehoash turned away from true worship, listening to wrong counsel rather than to Jehovah’s prophets. Zechariah, Jehoash’s cousin (2Ch 22:11), sternly warned the people about this, but instead of repenting, they stoned him in the temple courtyard. Zechariah’s dying words were: “Let Jehovah see to it and ask it back.” This prophetic request was granted, for not only did Syria do great damage to Judah but also Jehoash was killed by two of his servants “because of the blood of the sons of Jehoiada the priest.” The Greek Septuagint and the Latin Vulgate say that Jehoash was killed to avenge the blood of the “son” of Jehoiada. The Masoretic text and the Syriac Peshitta, however, read “sons,” possibly using the plural number to denote the excellence and worth of Jehoiada’s son Zechariah the prophet-priest.—2Ch 24:17-22, 25.

Zechariah the son of Jehoiada is most likely the one whom Jesus had in mind when prophesying that “the blood of all the prophets spilled from the founding of the world” will be required “from this generation [the Jews of the time of Jesus’ earthly ministry], from the blood of Abel down to the blood of Zechariah, who was slain between the altar and the house.” (Lu 11:50, 51) The places mentioned as the site of the slaying correspond. In the first century C.E., Chronicles was the last book in the canon of the Hebrew Scriptures. So Jesus’ phrase, “from Abel . . . to Zechariah,” was similar to our expression, “from Genesis to Revelation.” In the parallel account at Matthew 23:35, Zechariah is called the son of Barachiah, possibly another name for Jehoiada, unless, by chance, it indicates a generation between Jehoiada and Zechariah or is the name of an earlier ancestor

It is speaking of the martyrs and that from that time on that there would be a judgment according to works. The generation is better understood as from now on. Jesus is telling them to repent. He is criticizing the hypocrisies of his age. This is shown from the context of the verses before and after beginning from verse 37.

I guess because even after they heard that sermon they would kill again the Son of the living God.

This "generation" being the Jewish people.