Deuteronomy 7:9

Know therefore that the LORD thy God, he [is] God, the faithful God, who keepeth covenant and mercy with them that love him and keep his commandments to a thousand generations:

Hebrews 10:23 2 Timothy 2:13 Hebrews 10:23 2 Timothy 2:13 2 Thessalonians 3:3

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Know therefore that the LORD your God, he is God, the faithful God, which keeps covenant and mercy with them that love him and keep his commandments to a thousand generations;