John Gill Commentary 1 Kings 2:3

"and keep the charge of Jehovah thy God, to walk in his ways, to keep his statutes, [and] his commandments, and his ordinances, and his testimonies, according to that which is written in the law of Moses, that thou mayest prosper in all that thou doest, and whithersoever thou turnest thyself." — 1 Kings 2:3 (ASV)

And keep the charge of the Lord your God
Which may in general respect his whole walk and conversation, and his obedience to the law and will of God; and in particular his just government of Israel committed to his charge:

to walk in his ways ;
directed to in his word:

to keep his statutes and his judgments ;
his laws, ceremonial, moral, and judicial:

and his testimonies ;
as the above laws, which testify of his mind, and declare what he would have done and observed:

as it is written in the law of Moses ;
which a king of Israel was obliged to write a copy of, keep by him, and read it, and rule according to it, (Deuteronomy 17:18–20) :

that you may prosper in all that you do, and wherever you turn yourself ;
to reign in righteousness, and according to the law of God, is the only way to have a prosperous and happy reign: or "that you may act wisely" ^F16 ; the law of God furnishing the best rules of government and maxims of policy; see (Deuteronomy 4:6Deuteronomy 4:7) .

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FOOTNOTES:

• F16: (lykvt Neml) "ut prudenter agas", Montanus, Tigurine version; "ut intelligas universa", V. L.