Advice to keep the tongue ever-busy in Zikr

A Sahabi once said, "0 Rasulullah, (Sallallaho alaihe wasallam), I know that the commandments of Shareeat
are many, but of these tell me the one that I may practise assiduously throughout my life." The Prophet,
(Sallallaho alaihe wasallam), replied, "Keep your tongue always moist (i.e. busy) with the zikr of Allah." (Ibn Abi Syaibah, Ahmad, and Tirmidzi)

According to another hadith, Harat Mu'aaz (Radhiyallaho anho) has said, "Once at the time of my departure
from Rasulullah [Sallallaho alaihe wasallam), I asked him to advise me of that action which is most pleasing
to Almighty Allah: whereupon he replied, "At the time of your death, your tongue should be busy with zikr of
Almighty Allah."(Ibn Abi Dunya, Al Bazaar, Ibn Hibban, and Thabrani)

ZIKR: I TREAT MY SLAVE (MAN) ACCORDING TO HIS EXPECTATIONS FROM ME

Hadhrat Abu Hurairah (Radhiyallaho anho) narrated that Rasulullah (SALLALLAHU ALAIHI WASALLAM) has said, "Almighty Allah says, I treat my slave (man) according to his expectations from Me, and I am with him when he remembers Me. If he remembers Me in his heart, I remember him in My heart; if he remembers Me in a gathering, I remember him in a better and nobler gathering (i.e. of angels). If he comes closer to Me by one span, I go towards him a cubit's length, if he comes towards Me by a cubit's length, I go towards him an arm's length, and if he walks towards Me, I run unto him."