Ahaz was a bad king, 2 Kings 16:
2 Ahaz was twenty years old when he became king, and he reigned in Jerusalem sixteen years. Unlike David his father, he did not do what was right in the eyes of the LORD his God.
During his reign, Syria was in league with the kingdom of Israel to wage war against Judah (Isaiah 7:1-2)
God sent Isaiah to him,
4 And say to him, ‘Be careful, be quiet, do not fear, and do not let your heart be faint because of these two smoldering stumps of firebrands, at the fierce anger of Rezin and Syria and the son of Remaliah.
God promised Ahaz that he would take care of the situation.
10 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.”
Wasn’t Ahaz being good about this?
13 And he said, “Hear then, O house of David! Is it too little for you to weary men, that you weary my God also?
But Isaiah didn’t respond nicely to Ahaz.
14Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.
From Ahaz’s point of view, how was this sign fulfilled?