Concept of remembrance of Allah; Remembering Allah deep in the Earth -By Musa Halimat – Opinion Nigeria
Likewise the prophet was reported to have said in one of his hadith that "If your heart were always in a state of remembrance of Allah that they are in during dhikr, the angel would come to see you to the point that they would greet you in the middle of the road "
Source: opinionnigeria.com