Ibn Abd al-Rahman bin Abza narrates from his father (may Allah be pleased with him): I prayed behind the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) would not complete the takbir.
(b) In our view this is to be understood as meaning that he (peace and blessings be upon him) forgot to say the takbir, and therefore he did not prostrate for it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3861