Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) came out and saw a man in the mosque who was not completing his ruku' (bowing) and sujud (prostrations). So the Prophet (peace and blessings be upon him) said: "The prayer of a man who does not complete his ruku' and sujud is not accepted."
Imam al-Tabarani recorded this narration in al-Mu'jam al-Awsat and al-Mu'jam al-Saghir. Its chain mentions that Ibrahim narrated it from Abbad al-Kirmani. I have not found anyone who has given his biography.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2725
Hadith Gradingمحدثین:إسنادہ ضعیف
Hadith Takhrij«أخرجه المعجم الصغير للطبراني برقم: 680»