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THE LENGTH OF THE PROPHET'S VOLUNTARY NIGHT PRAYER
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.’”
Bukhari and Muslim with a chain up to ibn Mas'ud who related this.