Deuteronomy 10:20

20 Thou shalt dread thy Lord God, and thou shalt serve him alone, and thou shalt cleave to him, and thou shalt swear in his name. (Thou shalt fear the Lord thy God/Thou shalt revere the Lord thy God, and thou shalt serve him alone, and thou shalt cleave to him, and thou 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 He maketh doom to the fatherless, and motherless, and to the widow; he loveth a pilgrim, and giveth to him lifelode and clothing. (He getteth justice for the fatherless or the motherless child, and the widow; he loveth the foreigner, or the stranger, and giveth him sustenance and clothing.)

19 And therefore love ye pilgrims, for also ye were comelings in the land of Egypt. (And so love ye foreigners, or strangers, for ye were also newcomers in the land of Egypt.)

20 Thou shalt dread thy Lord God, and thou shalt serve him alone, and thou shalt cleave to him, and thou shalt swear in his name. (Thou shalt fear the Lord thy God/Thou shalt revere the Lord thy God, and thou shalt serve him alone, and thou shalt cleave to him, and thou shalt swear by his name.)

21 He is thy praising, and thy God, that made to thee these great works, and fearful, which thine eyes have seen. (He is thy praise, and thy God, who did for thee these great and fearful things, which thine eyes have seen.)

22 In seventy men thy fathers went down into Egypt, and lo! now thy Lord God hath multiplied thee as the stars of heaven. (For only seventy men of thy fathers went down to Egypt, but lo! now the Lord thy God hath made thee as innumerable as the stars in the heavens.)