It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he said: "We fasted twenty-nine (29) days with the Messenger of Allah (peace and blessings be upon him) more often than we fasted thirty (30) days."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Jurayri (may Allah have mercy on him) except al-Qasim bin Malik (may Allah have mercy on him), and Mujahid bin Musa (may Allah have mercy on him) is alone in it; and it is not narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) except with this chain."
Hadith Referenceالمعجم الأوسط / باب الميم / 6486
Hadith Takhrij«أخرجه ابن ماجه فى «سننه» برقم: 1658»