COMPLAINING

Numbers 11:1
And [when] the people complained, it displeased the LORD: and the LORD heard [it]; and his anger was kindled; and the fire of the LORD burnt among them, and consumed [them that were] in the uttermost parts of the camp.


Numbers 21:4-6
And they journeyed from mount Hor by the way of the Red sea, to compass the land of Edom: and the soul of the people was much discouraged because of the way. And the people spake against God, and against Moses, Wherefore have ye brought us up out of Egypt to die in the wilderness? for [there is] no bread, neither [is there any] water; and our soul loatheth this light bread. 
And the LORD sent fiery serpents among the people, and they bit the people; and much people of Israel died.


I Corinthians 10:10a
Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer.


Phillippians 2 :14-16
Do all things without murmurings and disputings:


Jude 16
To execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard [speeches] which ungodly sinners have spoken against him. 
These are murmurers, complainers, walking after their own lusts; and their mouth speaketh great swelling [words], having men's persons in admiration because of advantage.