Ephesians 4:29 Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear.

James 5:9 Do not grumble against one another, brothers, so that you may not be judged; behold, the Judge is standing at the door.

Psalm 106:They murmured in their tents, and did not obey the voice of the Lord.

Numbers 11:1-4 And the people complained in the hearing of the Lord about their misfortunes, and when the Lord heard it, his anger was kindled, and the fire of the Lord burned among them and consumed some outlying parts of the camp. Then the people cried out to Moses, and Moses prayed to the Lord, and the fire died down. So the name of that place was called Taberah, because the fire of the Lord burned among them. Now the rabble that was among them had a strong craving. And the people of Israel also wept again and said, “Oh that we had meat to eat!

Romans 12:2 Do not be conformed to this world, but be transformed by the renewal of your mind, that by testing you may discern what is the will of God, what is good and acceptable and perfect.

1 Corinthians 10:10 Nor grumble, as some of them did and were destroyed by the Destroyer.

Job 10:1 “I loathe my life; I will give free utterance to my complaint; I will speak in the bitterness of my soul.