Deuteronomy 10:20

20 Thou shalt fear the Lord thy God, and serve him, and shalt cleave to him, and shalt swear by his name.

Deuteronomy 10:20 Meaning and Commentary

Deuteronomy 10:20

Thou shalt fear the Lord thy God
Which includes the whole worship of him, external and internal:

him shalt thou serve;
heartily and sincerely, according to his revealed will, and him only:

and to him shall thou cleave;
and not turn aside to follow other gods, and worship them:

and swear by his name;
and his only, whenever it is necessary to take an oath, which should not be done rashly or on trivial accounts; and never by any creature, but by the living God; see ( Deuteronomy 6:13 ) .

Deuteronomy 10:20 In-Context

18 executing judgment for the stranger and orphan and widow, and he loves the stranger to give him food and raiment.
19 And ye shall love the stranger; for ye were strangers in the land of Egypt.
20 Thou shalt fear the Lord thy God, and serve him, and shalt cleave to him, and shalt swear by his name.
21 He thy boast, and he thy God, who has wrought in the midst of thee these great and glorious things, which thine eyes have seen.
22 With seventy souls your fathers went down into Egypt; but the Lord thy God has made thee as the stars of heaven in multitude.

The Brenton translation of the Septuagint is in the public domain.