رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 103
The Book of Miscellany
The Struggle (in the Cause of Allah)
التاسع: عَنِ ابْنِ مَسْعُودٍ رَضِيَ اللَّه عَنْهُ قَالَ: صَلَّيْتُ مَعَ النَّبِيِّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ لَيْلَةً، فأطال القيام حَتَّى هَمَمْتُ بِأَمْرِ سُوءٍ! قِيلَ: وَمَا هَمَمْتَ بِهِ؟ قَالَ: هَمَمْتُ أَنْ أَجْلِسَ وَأَدَعَهُ. ((مُتَّفَقٌ عَلَيْهِ)).
Ibn Mas'ud (May Allah be pleased with him) said: One night I joined the Prophet (ﷺ) in his (optional) Salat. He prolonged the standing so much that I thought of doing something evil. He was asked: "What did you intend to do?" He replied: "To sit down and leave him". [Al-Bukhari and Muslim].
Riyad as-Salihin, 103