1 Corinthians 9:17

For if I do this willingly, I have a reward: but if unwillingly, I have been intrusted with a dispensation.

2 Corinthians 8:12

For if there is first a willing mind, it is acceptable according to what one may have, and not according to what he has not.

2 Corinthians 9:7

As each one has predetermined in his heart; not of reluctance, or of constraint: for God loves the hilarious giver.

Philippians 2:13

for God is the one working in you both to will and to do, of his own good pleasure.

Revelation 16:5-6

And I heard the angel of the waters saying, Thou art worthy, who is, and who was, the Holy One, because thou hast judged these things;

Revelation 18:20

Rejoice over her, O heaven, and the saints, and the apostles, and the prophets; because God has judged your judgment from her.

Revelation 19:2

because his judgments are true and righteous; because he has judged the great harlot, who corrupted the earth by her fornication, and he has avenged the blood of his servants from her hand.

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, Thou art worthy, who is, and who was, the Holy One, because thou hast judged these things;
Revelation 18:20
Rejoice over her, O heaven, and the saints, and the apostles, and the prophets; because God has judged your judgment from her.
Revelation 19:2
because his judgments are true and righteous; because he has judged the great harlot, who corrupted the earth by her fornication, and he has avenged the blood of his servants from her hand.

When

1 Corinthians 9:17
For if I do this willingly, I have a reward: but if unwillingly, I have been intrusted with a dispensation.
2 Corinthians 8:12
For if there is first a willing mind, it is acceptable according to what one may have, and not according to what he has not.
2 Corinthians 9:7
As each one has predetermined in his heart; not of reluctance, or of constraint: for God loves the hilarious giver.
Philippians 2:13
for God is the one working in you both to will and to do, of his own good pleasure.
Philemon 1:14
but without your consent I did not wish to do anything; in order that your good might not be by constraint, but by the free will: