Tongue

Abdullah ibne-Busr (Radiyallahu Anhu) narrates
that a man said:
O Rasulullah ! (Sallallahu Alaihi Wasallam)
I know that the commandments of Sharia are many,
so please tell me the one to which I may adhere to.
Rasulullah (Sallallahu Alaihi Wasallam) replied:
Your tongue should always
remain busy and fresh with the Dhikr
of Allah.

{ Tirmidhi }