Deuteronomy 7:9

Know therefore that the Lord your God, he is God, the faithful God, who keeps covenant and loving kindness with them who 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;