Al-Adab Al-Mufrad, Book 11, Hadith 17 (In-Book) ⓘ

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.'"

حَدَّثَنَا مُحَمَّدُ بْنُ سَلامٍ، قَالَ‏:‏ أَخْبَرَنَا مُحَمَّدُ بْنُ الْفُضَيْلِ بْنِ غَزْوَانَ، عَنْ مُغِيرَةَ، عَنْ أُمِّ مُوسَى قَالَتْ‏:‏ سَمِعْتُ عَلِيًّا صَلَوَاتُ اللهِ عَلَيْهِ يَقُولُ‏:‏ أَمَرَ النَّبِيُّ صلى الله عليه وسلم عَبْدَ اللهِ بْنَ مَسْعُودٍ أَنْ يَصْعَدَ شَجَرَةً فَيَأْتِيَهُ مِنْهَا بِشَيْءٍ، فَنَظَرَ أَصْحَابُهُ إِلَى سَاقِ عَبْدِ اللهِ فَضَحِكُوا مِنْ حُمُوشَةِ سَاقَيْهِ، فَقَالَ رَسُولُ اللهِ صلى الله عليه وسلم‏:‏ مَا تَضْحَكُونَ‏؟‏ لَرِجْلُ عَبْدِ اللهِ أَثْقَلُ فِي الْمِيزَانِ مِنْ أُحُدٍ‏.‏