Jude 1:16 These are murmurers and complainers, walking after their lusts (and their mouth speaks proud things), showing respect of persons to gain advantage. (WEB KJV WEY ASV DBY WBS YLT)
Numbers 11:1 And the people were as murmurers, speaking evil in the ears of the LORD; and when the LORD heard it, His anger was kindled; and the fire of the LORD burnt among them, and devoured in the uttermost part of the camp. (JPS ASV)
Isaiah 29:24 And the erring in spirit have known understanding, And murmurers learn doctrine!' (YLT)