Isaiah 7:9-14

9And the head of Ephraim is Samaria, and the head of Samaria is the son of Remaliah. If you are not firm in faith, you will not be firm at all.'"

10Again the Lord spoke to Ahaz:

11"Ask a sign of the Lord your God; let it be deep as Sheol or high as heaven."

12But Ahaz said, "I will not ask, and I will not put the Lord to the test."

13And he said, "Hear then, O house of David! Is it too little for you to weary men, that you weary my God also?

14Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.