Al-Salt bin Iyas al-Hanafi (may Allah have mercy on him) narrates: Umayyah bin Abdullah bin Khalid bin Asid (may Allah have mercy on him) and I came to Sayyiduna Ibn Umar (may Allah be pleased with them both), and I said: "O Abu Abd al-Rahman, when did the Messenger of Allah (peace and blessings be upon him) use to pray witr?" He said: "In the last part of the night."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Salt bin Iyas (may Allah have mercy on him) except Abd al-Mu'min (may Allah have mercy on him), and Abu Tumaylah (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب العين / 4029
Hadith Takhrij«أخرجه ابن خزيمة فى «صحيحه» برقم: 1085، وابن حبان فى «صحيحه» برقم: 2446، والحاكم فى «المستدرك» برقم: 1125، وابن ماجه فى «سننه» برقم: 1202 (م)، والبيهقي فى «السنن الكبرى» برقم: 4918، والبزار فى «مسنده» برقم: 5726»