‏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....

‏الجهاد والسير‏ : Hadeeth No:4311 It is narrated on the authority of Jabir that the Messenger of Allaah (sallAllaahu alayhi wa sallam) said: War is a stratagem....