Hadithcore
Mishkat al-Masabih, 1261

‘A’isha said that during the whole night God’s Messenger observed, a <i>witr</i> at the beginning, middle and end, his <i>witr</i> finishing at dawn. (Bukhari and Muslim.)

وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: مِنْ كُلَّ اللَّيْلِ أَوْتَرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مِنْ أَوَّلِ اللَّيْلِ وَأَوْسَطِهِ وَآخِرِهِ وَانْتَهَى وَتْرُهُ إِلَى السَّحَرِ

References1 variant
In-Book Reference
Book 4, Hadith 676