It is the promise of God to king David and Abraham come true.
Recalling the time of David, who wanted to build a temple for God. God was happy with David's will, in return, God promised David his descendant will set on his throne forever.
Read 2 Samuel ch7 for the whole story.
So, your question, 耶穌借由母體誕下呢, must be specified that Jesus was born under Joseph (a descendant of David) and Mary ( also supposed to be a descendant of David).
Such that Jesus is the seed of David, the long awaited messiah promised in the old testament was fulfilled.
On the other hand, God had also promised Abraham that He will bless the whole world through his descendant, free them from the sin (Genesis 22:18) and of course, the promised descendant is Jesus.