NET
31 (for he is a merciful God), he will not let you down or destroy you, for he cannot forget the covenant with your ancestors that he confirmed by oath to them.
Darby
31 for Jehovah thy God is a merciful God, he will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which he swore unto them.
KJV
31 (For the LORD thy God [is] a merciful God;) he will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which he sware unto them.