Deuteronomy 10:20
You are to fear the LORD your God and serve Him. Hold fast to Him and take your oaths in His name.
Berean Standard Bible
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Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.
You shall fear the LORD your God. You shall serve him. You shall cling to him, and you shall swear by his name.