Hadith: O Messenger of Allah, Indeed, the laws of Islam are too many for us, so give us something comprehensive that we can hold on to. He said: Keep your tongue moist with the frequent remembrance of Allah, Exalted and Glorified

عن عبد الله بن بسر رضي الله عنه قال: أتى النبي صلى الله عليه وسلم رجل، فقال: يا رسول الله إن شرائع الإسلام قد كثرت علينا، فبابٌ نتمسك به جامع؟ قال: «لا يزال لسانك رَطْبًا من ذكر الله عز وجل ».
[صحيح] - [رواه الترمذي وابن ماجه وأحمد]

‘Abdullāh ibn Busr (may Allah be pleased with him) reported: A man came to the Prophet (may Allah's peace and blessings be upon him) and said: "O Messenger of Allah, indeed, the laws of Islam are too many for us, so give us something comprehensive that we can hold on to." He said: "Keep your tongue moist with the frequent remembrance of Allah, Exalted and Glorified."
Sahih/Authentic. - [Ibn Maajah]

Explanation

This Hadīth recounts that a man from among the noble Companions asked the Messenger of Allah (may Allah's peace and blessings be upon him) to direct him to something easy and comprehensive that would include all the aspects of goodness. So the Messenger of Allah (may Allah's peace and blessings be upon him) directed him to Dhikr, saying: "Keep your tongue moist," meaning fresh with the remembrance of Allah, frequently and continuously, throughout the night and day. he chose Dhikr for him due to its easiness, the multiplicity of its reward, and its innumerable tremendous benefits.