Abu Hurairah narrated that Muhammad said, "People will not sit in an assembly in which they remember Allah without the angels surrounding them, mercy covering them, and Allah Mentioning them among those who are with Him" (Sahih Muslim).
It is mentioned in hadith that where people are oblivious to dhikir, remembrance of Allah is like being steadfast in jihad when others are running away (Targhib, p. 193, vol. 3 ref.