Deuteronomy 10:20

¹⁸ He doth execute the judgment of the fatherless and widow, and loveth the stranger, in giving him food and raiment.

¹⁹ Love ye therefore the stranger: for ye were strangers in the land of Egypt.

Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.

²¹ He is thy praise, and he is thy God, that hath done for thee these great and terrible things, which thine eyes have seen.

²² Thy fathers went down into Egypt with threescore and ten persons; and now the LORD thy God hath made thee as the stars of heaven for multitude.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: You are to fear the LORD your God and serve Him. Hold fast to Him and take your oaths in His name.
KJV: Thou shalt fear the LORD thy God; him shalt thou serve, and to him shalt thou cleave, and swear by his name.
WEB: You shall fear the LORD your God. You shall serve him. You shall cling to him, and you shall swear by his name.
ASV: Thou shalt fear Jehovah thy God; him shalt thou serve; and to him shalt thou cleave, and by his name shalt thou swear.
DARBY: Thou shalt fear Jehovah thy God; him thou shalt serve, and unto him shalt thou cleave, and swear by his name.
BLB: YHWH your God you shall fear; Him you shall serve, and to Him you shall hold fast, and by His name you shall swear.

ÅB: Herren din Gud skal du frykte, ham skal du tjene, og ham skal du holde fast ved, og ved hans navn skal du sverge.
OTB: Frykt Herren din Gud og tjen Ham. Hold deg nær til Ham og sverg ved Hans navn.
B1930: Herren din Gud skal du frykte, ham skal du tjene, og ham skal du holde fast ved, og ved hans navn skal du sverge.

Deuteronomy 6:13
Thou shalt fear the LORD thy God, and serve him, and shalt swear by his name.
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Deuteronomy 13:4
Ye shall walk after the LORD your God, and fear him, and keep his commandments, and obey his voice, and ye shall serve him, and cleave unto him.
Read in context
Luke 4:8
And Jesus answered and said unto him, Get thee behind me, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
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Deuteronomy 11:22
For if ye shall diligently keep all these commandments which I command you, to do them, to love the LORD your God, to walk in all his ways, and to cleave unto him;
Read in context
Matthew 4:10
Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
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Psalms 63:11
But the king shall rejoice in God; every one that sweareth by him shall glory: but the mouth of them that speak lies shall be stopped.
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Isaiah 45:23
I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
Read in context
Deuteronomy 4:4
But ye that did cleave unto the LORD your God are alive every one of you this day.
Read in context