5But because of your hard and impenitent heart you are storing up wrath for yourself on the day of wrath when God’s righteous judgment will be revealed.
6 He will render to each one according to his works: 7 to those who by patience in well-doing seek for glory and honor and immortality, he will give eternal life; 8 but for those who are self-seeking and do not obey the truth, but obey unrighteousness, there will be wrath and fury.
Romans 2:5-8 (ESV)
30 For we know him who said, “Vengeance is mine; I will repay.” And again, “The Lord will judge his people.”
Hebrews 10:30 (ESV)