2 Corinthians 9:7
9:7 Each one of you should give just as he has decided in his heart, not reluctantly or under compulsion, because God loves a cheerful giver.
Philippians 2:14
2:14 Do everything without grumbling or arguing,
Philemon 1:14
1:14 However, without your consent I did not want to do anything, so that your good deed would not be out of compulsion, but from your own willingness.
James 5:9
5:9 Do not grumble against one another, brothers and sisters, so that you may not be judged. See, the judge stands before the gates!