Deuteronomy 7:10-12

10 but who repays with destruction those who hate him; he does not delay with those who hate him, but makes them pay for it.

11 Therefore carefully observe the commandment, the statutes and the ordinances which I command you today.

12 [AK] As your reward for heeding these ordinances and keeping them carefully, the Lord, your God, will keep with you the covenant mercy he promised on oath to your ancestors.