‏الصلاة : Hadeeth No:2121 Abu Marthad al-Ghanawi reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Do not sit on the graves and do not pray facing towards them....

‏الصلاة : Hadeeth No:1136 This hadith has been narrated on the authority of Anas by another chain of transmitters....