THE LENGTH OF THE PROPHET'S VOLUNTARY NIGHT PRAYER H 1197 "One night ibn Mas'ud joined the Prophet, praise and peace be upon him, in his voluntary prayer. He prolonged the standing so much that ibn Mas'ud thought of something impertinent. He was asked, 'What was that?' He answered, 'To sit down and stop following him.'" R 1197 Bukhari and Muslim with a chain up to ibn Mas'ud who related this.
1174- وعن ابن مسعود رضي الله عنه ، قَالَ : صَلَّيْتُ مَعَ النَّبيِّ صلى الله عليه وآله وسلم لَيْلَةً ، فَلَمْ يَزَلْ قائِماً حَتَّى هَمَمْتُ بِأَمْر سوءٍ ! قيلَ : مَا هَمَمْتَ ؟ قَالَ : هَمَمْتُ أنْ أجِلْسَ وَأدَعَهُ . متفقٌ عَلَيْهِ