Ata bin Abi Rabah saw no harm in making ropes and cords from human hair, and the mention of dogs’ saliva and their passing through the mosque. Zuhri says that when a dog puts its mouth into a (water-filled) vessel and there is no other water available for ablution, then ablution can be performed with it. Sufyan says that this issue is understood from Allah Almighty’s statement: When you do not find water, then perform tayammum, and the water licked by a dog is (still) water. (However) the nature dislikes it. (In any case) perform ablution with it, and (as a precaution) also perform tayammum.

Narrated Ibn Seereen: I said to `Abida, "I have some of the hair of the Prophet which I got from Anas or from his family." `Abida replied. "No doubt if I had a single hair of that it would have been dearer to me than the whole world and whatever is in it."