765 - al-Walid said: And 'Abd al-Rahman ibn Namir al-Yahsubi informed me that he asked Ibn Shihab al-Zuhri about one who forgot the opening Takbir while he had said the Takbir for bowing? He said: "His prayer has passed (is valid), and he should perform two prostrations of forgetfulness."
al-Walid said: I mentioned that to Abu 'Amr, and Abu 'Amr narrated to us, from Ibn Shihab al-Zuhri, the same.
766 - 'Abbas ibn 'Abd al-'Azim narrated to us, he said: 'Uthman ibn 'Umar narrated to us, he said: Yunus informed us, from al-Zuhri, from Sa'id ibn al-Musayyib, he said: "If he forgets the opening Takbir, the Takbir for bowing suffices him."
'Abbas said: "If he intends it," meaning: that he intends it to be for the opening.
Chapter: A man catches the Imam while he is bowing; does one Takbir suffice him?
Ahmad was asked about a man who catches the Imam while he is bowing; does one Takbir suffice him? He said: "Yes, and likewise if he catches him prostrating."
And I heard Ishaq say: "If a man comes to the Imam and some of the prayer has already passed him, and he finds him bowing, he should open the prayer with a Takbir in which he intends the opening of the prayer, then he should say the Takbir and bow. If he says one Takbir and intends by it the opening of the prayer, and does not say another Takbir until he bows, it suffices him. And if he says a Takbir at the time of bowing, intending by it only the opening of the prayer, and did not intend by it both the opening of the prayer and the rak'ah, it suffices him—even if he does not say the Takbir for bowing. But if he intends by the Takbir both the opening and the rak'ah, his prayer is not valid; because he did not say the Takbir for the sanctification (tahrim) of the prayer exclusively. He must not omit the Takbirs for bowing and prostrating. The first Takbir is an obligation without which the prayer is not complete; if he misses it intentionally or forgets it, his prayer is void; because it is the opening of the prayer."
