‏الصلاة : Hadeeth No:1727 Abu Musa al-Ash'ari reported Allaah's Prophet (sallAllaahu alayhi wa sallam) as saying: Keep refreshing your knowledge of the Qur'an, for I swear by Him in Whose Hand is the life of Mahammad that it is more liable to escape than camels which are hobbled....

‏الصلاة : Hadeeth No:2116 Jabir said: Allaah's Messenger (sallAllaahu alayhi wa sallam) forbade that the graves should be plastered or they be used as sitting places (for the people), or a building should be built over them....