You shall fear the LORD your God; him shall you serve, and to him shall you cleave, and swear by his name.
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George Leo Haydock
Only, a word not found in the Hebrew, but deemed necessary by the Septuagint to express the true meaning of this passage. See chap. vi. 13. (Calmet)
Name, when an oath is necessary. Thou shalt never swear by false gods. (Worthington)