Murmuring

of the Hebrews in the wilderness, called forth the displeasure
of God, which was only averted by the earnest prayer of Moses
(Num. 11:33, 34; 12; 14:27, 30, 31; 16:3; 21:4-6; Ps. 106:25).
Forbidden by Paul (1 Cor. 10:10).