David then calleth him Lord. And how is he his son?

how.

Luke 1:31-35 Behold thou shalt conceive in thy womb and shalt bring forth a son: and thou shalt call his name Jesus. . . .

Luke 2:11 For, this day is born to you a Saviour, who is Christ the Lord, in the city of David.

Isaiah 7:14 Therefore the Lord himself shall give you a sign. Behold a virgin shall conceive, and bear a son and his name shall be called Emmanuel.

Matthew 1:23 Behold a virgin shall be with child, and bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.

Romans 9:5 Whose are the fathers and of whom is Christ, according to the flesh, who is over all things, God blessed for ever. Amen.

Galatians 4:4 But when the fulness of the time was come, God sent his Son, made of a woman, made under the law:

1 Timothy 3:16 And evidently great is the mystery of godliness, which was manifested in the flesh, was justified in the spirit, appeared unto angels, hath been preached unto the Gentiles, is believed in the world, is taken up in glory.

Revelation 22:16 I, Jesus, have sent my angel, to testify to you these things in the churches. I am the root and stock of David, the bright and morning star.