A man who forgets the opening takbir

Ibrahim said: When a person forgets the opening takbir (takbir al-tahrimah), he should start the prayer afresh.

Al-Hasan said: If a person forgets the opening takbir, the takbir of bowing suffices for him.

Al-Zuhri said about a person who forgets the opening takbir when beginning the prayer: he should say the takbir when he remembers. If he remembers only after finishing the prayer, his prayer is valid, because the takbir of bowing suffices for him.

Hammad said: If the imam forgets the opening takbir with which the prayer is begun, he should repeat the prayer. Al-Hakam said: The takbir of bowing will suffice for him.

Bakr said: He should say the takbir when he remembers.