Tabarruk

Uthman bin ‘Abdullah bin Mauhab said, “My people sent me with a bowl of water to Um Salama Radiyallaaho T`aalaa A`nhaa.” Isra’il approximated three fingers (‘indicating the small size of the container in which there was some hair of the Prophet Ssallallaaho A`laihe Wa Aalihi Wa Sallam.’Uthman Radiyallaaho T`aalaa A`nho added, “If any person suffered from evil eye or some other disease, he would send a vessel (containing water) to Um Salama Radiyallaaho T`aalaa A`nhaa. I looked into the container (that held the hair of the Prophet Ssallallaaho A`laihe Wa Aalihi Wa Sallam) and saw a few red hairs in it,”
(Sahih Bukhari, Volume 7, Book 72, Number 784)