Deuteronomy 7:12
"Wherefore it shall come to pass, if ye hearken to these judgments, and keep, and do them, that the LORD thy God shall keep unto thee the covenant and the mercy which he sware unto thy fathers:"
Cross References (ranked by relevance)
Deuteronomy 7:9
Know therefore that the LORD thy God, he is God, the faithful God, which keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations;
Micah 7:20
Thou wilt perform the truth to Jacob, and the mercy to Abraham, which thou hast sworn unto our fathers from the days of old.
Luke 1:55
As he spake to our fathers, to Abraham, and to his seed for ever.