Narrated by Aisha (may Allah be pleased with her), she states that the Messenger of Allah (peace be upon him) performed Witr in every part of the night, and in the latter part of his life, his Witr would (usually) end at the time of Sahar (pre-dawn).
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 389
Hadith Takhrijاخرجه البخاري الوتر، باب ساعات الوتر (996) ومسلم صلاة المسافرين، باب صلاة الليل وعدد ركعات النبي في الليل...... الخ (745).
Narrated from Aisha (may Allah be pleased with her) that the Prophet (peace be upon him) used to pray five rak'ahs of Witr, sitting for Tashahhud only in the last rak'ah, and then he would say the Salam.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 390
Hadith Takhrijاخرجه مسلم، صلاة المسافرين، باب صلاة الليل وعدد ركعات النبي في الليل...... الخ (737).
It is narrated from Ibn Shihab that Sa'd bin Abi Waqqas (may Allah be pleased with him) used to perform one rak'ah of Witr.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 391
Hadith Takhrijاسنادہ ضعیف لارسالہ فان الزہری لم یدرک سعد بن ابی وقاص اخرجه البيهقي في معرفة السنن والآثار (1389) - وعبد الرزاق (4643)، وابن ابی شیبه (6809) - ومالك في الموطا، كتاب الصلاة، باب صلوة النبي الامام في الوتر.
It is narrated from Nafi' (may Allah have mercy on him) who states: I was with Ibn Umar (may Allah be pleased with them both) in Makkah and there were clouds covering the sky. Ibn Umar (may Allah be pleased with them both) feared that true dawn had appeared, so he performed one rak'ah of witr. Then the clouds cleared, and he saw that it was still night, so he made it even by performing another rak'ah.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 392
Hadith Takhrijاسنادہ صحیح: اخرجه البيهقى فى معرفة السنن والآثار (1395) - ومالك في الموطا، كتاب الصلاة، باب صلوة النبي ﷺ في الوتر.
It is narrated from Nafi' (may Allah have mercy on him) that Ibn Umar (may Allah be pleased with them both), when he performed three rak'ahs of Witr, would say salam after two rak'ahs and then would even engage in conversation if needed.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 393
Hadith Takhrijاخرجہ البخاری، الوتر، باب ما جاء فی الوتر (991)۔
Kuraib, the freed slave of Ibn Abbas (may Allah be pleased with them), narrates that he saw Muawiyah (may Allah be pleased with him) perform the Isha prayer, and then he did not pray anything except one rak'ah of Witr. Kuraib (may Allah have mercy on him) related this to Ibn Abbas (may Allah be pleased with them), so he said: "He has spoken the truth. O son! None of us knows more about this matter than Muawiyah (may Allah be pleased with him). This Witr can be one, or five, or more than seven. One may pray as many as he wishes."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 394
Hadith Takhrijاسنادہ ضعیف: فان عتبہ بن محمد مقبول حیث یتابع ولم یتابع اخرجہ البیہقی: 24/3 (4457) ۔ وعبدالرزاق (4641) ۔ ورواہ البخاری من غیر ھذا الطریق، انظر صحیح البخاری، فضائل اصحاب النبی، باب ذکر معاویہ (3764)، (3765)۔
It is narrated from Sa’ib bin Yazid (may Allah have mercy on him) that a man asked Abdur Rahman al-Taimi about the prayer of Talha (may Allah be pleased with him), so Abdur Rahman al-Taimi said, "If you wish, I can tell you about the prayer of Uthman (may Allah be pleased with him)." He said, "One night, I was in a place when suddenly I got up and a man, who had his head covered, bumped into me. I looked and saw that it was Uthman (may Allah be pleased with him). I stood behind him and he prayed, and he would perform prostrations of the Qur'an until I said: 'Fajr is about to break,' and he did not pray anything except one rak'ah of Witr."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 395
Hadith Takhrijاخرجہ البیہقی فی معرفۃ السنن والآثار (1391) ۔ اسنادہ صحیح وقد صرح ابن جریج بالسماع عند عبدالرزاق (4653)۔
It is narrated from Hattan bin Abdullah (may Allah have mercy on him) who states that Ali (may Allah be pleased with him) said: "Witr is of three types. Whoever among you wishes to perform it in the first part of the night, let him do so. Then, if he wakes up, he may, if he wishes, make it even by adding one rak'ah and then pray two by two rak'ahs until the true dawn appears. And if he wishes, he may perform witr in the last part of the night."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 396