Sahih Muslim | Book 1 | Hadith Number 64
Narrated by 'Abdullah b. 'Amr b. al-As
'Abdullah b. Amr b. al-As is reported to have said: Verily a person asked the Messenger of Allah (may peace and blessings be upon him) who amongst the Muslims was better. Upon this (the Holy Prophet) remarked: From whose hand and tongue the Muslims are safe.