Sahih al-Bukhari, Hadith 1135 ⓘ
Narrated Abu-Wail: `Abdullah said, "One night I offered the Tahajjud prayer with the Prophet and he kept on standing till an ill-thought came to me." We said, "What was the ill-thought?" He said, "It was to sit down and leave the Prophet (standing)."
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الأَعْمَشِ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ صَلَّيْتُ مَعَ النَّبِيِّ صلى الله عليه وسلم لَيْلَةً، فَلَمْ يَزَلْ قَائِمًا حَتَّى هَمَمْتُ بِأَمْرِ سَوْءٍ. قُلْنَا وَمَا هَمَمْتَ قَالَ هَمَمْتَ أَنْ أَقْعُدَ وَأَذَرَ النَّبِيَّ صلى الله عليه وسلم.
also referenced under: Book 19, Hadith 16 (In-Book) & Volume 2, Book 21, Hadith 236 (USC-MSA)