1 Corinthians 9:17

If I do this work willingly, I have a reward; but, if unwillingly, I have been charged to perform a duty.

2 Corinthians 8:12

For, where there is willingness, a man's gift is valued by its comparison with what he has, and not with what he has not.

2 Corinthians 9:7

Let every one give as he has determined before hand, not grudgingly or under compulsion; for God loves 'a cheerful giver.'

Philippians 2:13

Remember it is God who, in his kindness, is at work within you, enabling you both to will and to work.

Revelation 16:5-6

And I heard the Angel of the Waters saying-- 'Righteous art thou, thou who art and who wast, the Holy One, in inflicting this judgment;

Revelation 18:20

Rejoice over her, O Heaven, and People of Christ, and Apostles, and Prophets, for God has avenged you on her!

Revelation 19:2

for true and righteous are his judgments. For he has passed judgment upon the Great Harlot who was corrupting the earth by her licentiousness, and he has taken vengeance upon her for the blood of his servants.'

Treasury of Scripture Knowledge

Summary

Praise ye the LORD for the avenging of Israel, when the people willingly offered themselves.

Bible References

For the avenging

Revelation 16:5
And I heard the Angel of the Waters saying-- 'Righteous art thou, thou who art and who wast, the Holy One, in inflicting this judgment;
Revelation 18:20
Rejoice over her, O Heaven, and People of Christ, and Apostles, and Prophets, for God has avenged you on her!
Revelation 19:2
for true and righteous are his judgments. For he has passed judgment upon the Great Harlot who was corrupting the earth by her licentiousness, and he has taken vengeance upon her for the blood of his servants.'

When

1 Corinthians 9:17
If I do this work willingly, I have a reward; but, if unwillingly, I have been charged to perform a duty.
2 Corinthians 8:12
For, where there is willingness, a man's gift is valued by its comparison with what he has, and not with what he has not.
2 Corinthians 9:7
Let every one give as he has determined before hand, not grudgingly or under compulsion; for God loves 'a cheerful giver.'
Philippians 2:13
Remember it is God who, in his kindness, is at work within you, enabling you both to will and to work.
Philemon 1:14
But I do not wish to do anything without your consent, because I want your generosity to be voluntary and not, as it were, compulsory.