Isaiah 7:14

14 Therefore the Lord himself will give you⁺ a sign: look, the young woman will be pregnant, and give birth to a son, and will call his name Immanuel.[fn]

Footnotes

young woman, this follows the Hebrew. The Septuagint reads 'virgin'. See The Virgin Birth for the full discussion.

Immanuel, see also 8:8 and 8:10.