عن جابر يقول: سمعت النبي صلى الله عليه وسلم يقول: المسلم من سلم المسلمون من لسانه ويده (صحيح مسلم رقم 41)

Hazrat Jaabir (radhiyallahu ‘anhu) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “A (complete and perfect) Muslim is one who is such that other Muslims are safe from the harm of his tongue and hand (i.e. people are not inconvenienced through him in any way).”

Note: The word ‘Muslim’ is derived from the word ‘Islam’ which connotes submission and obedience to Allah Ta‘ala. One of the root words of the word Muslim is ‘salm’ which means ‘showing peace’. Hence, the meaning of this Hadith is that a complete and perfect Muslim is one fulfills the command of Allah Ta‘ala at all times and is a means of peace and mercy to the creation. He is concerned at all times of not causing even the least amount of inconvenience to the entire creation.

Since the harm that comes to people is generally caused through the tongue and hand, Rasulullah (sallallahu ‘alaihi wasallam) made special mention of these two limbs.