Isaiah 7: 10-16

7  10 Again the Lord spoke to Ahaz, saying, 11 “Ask a sign of the Lord your God; let it be deep as Sheol or high as heaven.” 12 But Ahaz said, “I will not ask, and I will not put the Lord to the test.” 13 Then Isaiah said, “Hear then, O house of David! Is it too little for you to weary mortals that you weary my God also? 14 Therefore the Lord himself will give you a sign. Look, the young woman is with child and shall bear a son and shall name him Immanuel. 15 He shall eat curds and honey by the time he knows how to refuse the evil and choose the good. 16 For before the child knows how to refuse the evil and choose the good, the land before whose two kings you are in dread will be deserted.

Matthew 1: 18-25

1  18 Now the birth of Jesus the Messiah took place in this way. When his mother Mary had been engaged to Joseph, but before they lived together, she was found to be pregnant from the Holy Spirit. 19 Her husband Joseph, being a righteous man and unwilling to expose her to public disgrace, planned to divorce her quietly. 20 But just when he had resolved to do this, an angel of the Lord appeared to him in a dream and said, “Joseph, son of David, do not be afraid to take Mary as your wife, for the child conceived in her is from the Holy Spirit. 21 She will bear a son, and you are to name him Jesus, for he will save his people from their sins.” 22 All this took place to fulfill what had been spoken by the Lord through the prophet:

23 “Look, the virgin shall become pregnant and give birth to a son,
and they shall name him Emmanuel,”

which means, “God is with us.” 24 When Joseph awoke from sleep, he did as the angel of the Lord commanded him; he took her as his wife 25 but had no marital relations with her until she had given birth to a son, and he named him Jesus.