Riyad as-Salihin: The Book of Virtues – Hadith No. 495 — Ibn Mas’ud (May Allah be pleased with him) reported: One night I joined the… (Hadith No. 495)

Ibn Mas'ud (May Allah be pleased with him) reported: One night I joined the Prophet (ﷺ) in his (optional) Salat. He (ﷺ) prolonged the Qiyam (standing) so much that I made up my mind to commit an act of wrong. He was questioned: "What did you intend to do?" He replied: "I intended to sit down and stop following him (in Salat).".

Explanation:

Reference: Riyad as-Salihin, The Book of Virtues, Hadith No. 495