Umm Musa said, "I heard 'Ali say that the Prophet, may Allah bless
him and grant him peace, commanded 'Abdullah ibn Mas'ud to climb a tree
and bring him something from it. His Companions looked at 'Abdullah's thigh
and laughed at its thinness. The Messenger of Allah, may Allah bless him
and grant him peace, said, 'Why are you laughing? 'Abdullah's foot is heavier
in the balance than the mountain of Uhud.'"