Sahih al-Bukhari 1135
Sahih al-Bukhari · Book 19: Prayer at Night (Tahajjud) · To prolong the standing posture in the Tahajjud
Narrated Abu-Wail:
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.
`Abdullah said, "One night I offered the Tahajjud prayer with the Prophet (ﷺ) 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)."