Perhaps you should also know why Abdullah ibn Masood 's thin legs will be the weightier than Mt.Uhud on the day of Judgement. It is reported that 'Abdullah bin Mas'ood had thin, weak legs. Once, upon seeing his leg uncovered, some people laughed, whereupon the Prophet (peace be on him) said, "Are you laughing at the frailty of his legs? By Him in Whose hand is my soul, in the scale of Allah they are weightier than Mount Uhud. " (Ahmad.)