Isaiah 7:14: the sign given to Ahaz, and why the word "virgin" is argued over

Ahaz is king of Judah and under pressure from an alliance of two neighbouring kingdoms. Isaiah comes to him with a message of calm and invites him to ask for a sign; Ahaz refuses, with a pious excuse the text treats as evasion.

It is at that point that the sign is given anyway. The following verses speak of a short deadline: before the child knows how to tell good from evil, the threat will have passed. The sign therefore has an immediate function in that crisis.

The Hebrew word used here denotes a young woman of marriageable age, without asserting or denying virginity. Hebrew has another, more specific word, and Isaiah does not use it. That much is settled among scholars across traditions.

The Greek translation made by Jews before Christianity rendered the term with a word that points more clearly to virginity. That translation circulated in the Greek-speaking world, and it is the one Matthew draws on when he quotes the verse and applies it to the birth of Jesus.

From there the readings divide. The Jewish reading takes the sign as fulfilled in the eighth century itself, in a child of that time. The Christian reading takes the text to have a larger fulfilment, without necessarily denying the first — and Christian traditions differ among themselves over how the two levels are joined. What no reading disputes is the meaning of the name.

For anyone arriving here in December, the verse has a use that does not depend on the argument: it says that God’s sign, at a moment of political panic, was a child. Not an show of power, not an explanation — a birth.

And for anyone arriving because of a debate, it is worth one step before quoting. Knowing that the word is contested, and why, makes the conversation more honest and usually makes it more productive than the bare citation.