‏الطهارة : Hadeeth No:549 Abu Huraira reported: The Messenger of Allaah (sallAllaahu alayhi wa sallam) said: The purification of the utensil belonging to any one of you, after it is licked by a dog, lies in washing it seven times, using sand for the first time....

‏الحج : Hadeeth No:2957 This badith has been transmitted by A'mash with a slight variation of words, i. e. he said before its time when it was still dark....