Why did Jesus say this?

It was the one question they could not answer without admitting that Yeshua was the messiah. After Yeshua asked them this question they stopped trying to trap Him in His words because they knew who He was but refused to acknowledge Him. In the Hebrew Matthew it reads like this:

44 Yehovah Yeshua said unto Yeshua Yehovah, Sit thou on my right hand, till I make thine enemies thy footstool?

44 The God of Salvation said to Salvation sent by God, sit at my right hand until I make your enemies your footstool.

Yeshua, the actual name of "Jesus", means "salvation" in Hebrew.

Gen 49:18  I have waitedH6960 for thy salvation,H3444 O LORD.H3068

H3444 יְשׁוּעָה yeshû‛âh yesh-oo'-aw

Feminine passive participle of H3467; something saved, that is, (abstractly) deliverance; hence aid, victory, prosperity: - deliverance, health, help (-ing), salvation, save, saving (health), welfare.

Total KJV occurrences: 78

By reciting the rosary each day with care, a person can better know the true meanings of Bible verses.

Jesus is God. Jesus is the Lord of David since Jesus is God. Jesus is the Son of David since Jesus came into the world through the line of David.

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Nobody can be good enough to avoid hell. The truth is that death leads to immediate heaven or hell, depending only on whether the person believed in Jesus for eternal life, or not.

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The truth is that Jesus loves you and wants to bless your life freely :) Most of all, Jesus wants you with Him forever, and not in hell. The truth is that every belief except one will lead to eternal torment in the lake of fire for every person. Because nothing pays for our sins except the death and blood of Jesus, the sacrifice of Jesus that is already accomplished by Him . Jesus loves you! The truth is that Jesus is God, and Jesus died on the cross to pay for all of our sins in full, and then Jesus resurrected from the dead. Nothing else pays for our sins, not works, not deeds, not religions. So the only way to heaven and to avoid hell, is by believing in Jesus for eternal life (John 6:47), without adding any of your own works (Romans 4:5). Believe in Jesus to take you to heaven, and you will be in heaven, no matter what, guaranteed. That easy, thanks to Jesus! Tell Jesus that you thank Him that you will be with Him in heaven when you die, because you believe in Jesus! It is too late to be saved, after death

because he supposedly also said this beforehand... “Watch out for false prophets. They come to you in sheep's clothing, but inwardly they are ferocious wolves. By their fruit.

Verse 40 was the the conclusion of 36-39 - 36 “Teacher, which is the great commandment in the Law?” 37 And He said to him, “‘You shall love the Lord your God with all your heart, and with all your soul, and with all your mind.’ 38 This is the great and foremost commandment. 39 The second is like it, ‘You shall love your neighbor as yourself.’

The rest was about Jesus asking them a question that would stump them, who were suppose to be knowledgeable of the scriptures and their meanings. The context is concluded in verses 45,46 - 45 If David then calls Him ‘Lord,’ how is He his son?” 46 No one was able to answer Him a word, nor did anyone dare from that day on to ask Him another question.

Because He is God.

Yeah, sorry. You're going to have to prove to me that he said it first.