Sahih Ibn Khuzaymah

Hazrat Ikrimah (may Allah have mercy on him) narrates that I said to Sayyiduna Ibn Abbas (may Allah be pleased with both of them) that I have performed the Zuhr prayer in (the valley of) Batha behind an old man of weak intellect, and he said twenty-two takbeers. When he performed sajdah, and when he performed ruku, and when he raised his head from ruku (he said takbeer). So Sayyiduna Ibn Abbas (may Allah be pleased with both of them) said, "This is the Sunnah of Abu al-Qasim (peace and blessings be upon him)." Ibn Khushram narrated in his version that, "This is the Sunnah of Abu al-Qasim (peace and blessings be upon him) or the prayer of Abu al-Qasim (peace and blessings be upon him)." Janab Sa'id narrated these words with doubt, while Janab Nasr narrated these words without doubt that, "This is the prayer of Abu al-Qasim (peace and blessings be upon him)."