Anf-01 viii.iv.xliii Pg 10
Isa. vii. 10–17 with Isa. viii. 4 inserted. The last clause may also be translated, “in which He took away from Judah Ephraim, even the king of Assyria.”
Now it is evident to all, that in the race of Abraham according to the flesh no one has been born of a virgin, or is said to have been born [of a virgin], save this our Christ. But since you and your teachers venture to affirm that in the prophecy of Isaiah it is not said, ‘Behold, the virgin shall conceive,’ but, ‘Behold, the young woman shall conceive, and bear a son;’ and [since] you explain the prophecy as if [it referred] to Hezekiah, who was your king, I shall endeavour to discuss shortly this point in opposition to you, and to show that reference is made to Him who is acknowledged by us as Christ.
Treasury of Scriptural Knowledge, Chapter 17
VERSE (21) - 1Ki 11:11,31; 14:8 Isa 7:17