Tirmidhi

“A man once told the Prophet (صلى الله عليه وآلہ وسلم): “The roads to good are many and I am unable to take all of them, so please tell me something to which I can hold fast, but do not overburden me lest I forget it.” He (صلى الله عليه وآلہ وسلم) said: “Make sure that your tongue is moist and supple with the remembrance of Allah, the Exalted.”