(119) بَابُ الْخُرُوجِ إِلَى الضَّيْعَةِ
Umm Musa said, "I heard 'Ali say that the Prophet, may Allah blesshim and grant him peace, commanded 'Abdullah ibn Mas'ud to climb a treeand bring him something from it. His Companions looked at 'Abdullah's thighand laughed at its thinness. The Messenger of Allah, may Allah bless himand grant him peace, said, 'Why are you laughing? 'Abdullah's foot is heavierin the balance than the mountain of Uhud.'"
Reference: Al-Adab Al-Mufrad 237
In-book reference: Book 11, Hadith 17
English translation: Book 11, Hadith 237