John Gill Commentary Deuteronomy 30:8

"And thou shalt return and obey the voice of Jehovah, and do all his commandments which I command thee this day." — Deuteronomy 30:8 (ASV)

And you shall return, and obey the voice of the Lord
In the Gospel; obey the form of doctrine delivered to them, embrace the truth of the Gospel cordially, and yield a cheerful subjection to the ordinances of it; or receive the Word of the Lord, as the Targum of Jonathan, Christ, the essential Word, by faith, as the Saviour and Redeemer, Mediator, Prophet, Priest, and King:

and do all his commandments which I command you this day ;
the commandment near them, in their mouths and hearts, even the word of faith, the ministers of Christ preach, (Deuteronomy 30:11) ; besides, all the moral precepts and commands of the law, which will then be in force, being eternal and invariable; which faith in Christ, and love to him, will influence and constrain them to observe.