'Abdullah bin Mas'ud Radiyallahu 'Anhu reports:
"Once at night I performed salaah with Rasulullah Sallallahu 'Alayhi Wasallam. Rasulullah Sallallahu 'Alayhi Wasallam stood for such a long time that I intended to commit an evil deed". Someone asked him what deed did you intend to commit? He replied. "To sit down and leave Rasulullah Sallallahu 'Alayhi Wasallam alone". (FR)
English reference (FR): Book 39, Hadith 262 (FR)
Arabic reference (FR): Book 40, Hadith 277 (FR)