And We have sent down to you (O Muhammad) the Book (this Quran) in truth, confirming the Scripture that came before it and Mohayminan (trustworthy in highness and a witness) over it (old Scriptures). So judge between them by what Allah has revealed, and follow not their vain desires, diverging away from the truth that has come to you. To each among you, We have prescribed a law and a clear way. If Allah willed, He would have made you one nation, but that (He) may test you in what He has given you; so strive as in a race in good deeds. The return of you (all) is to Allah; then He will inform you about that in which you used to differ.
Meaning:-
Vain: producing no result; useless.
Diverging: to follow a different direction, or to be or become different:
Prescribed: as a rule or a course of action to be followed, set down as a rule or guide · appointed, decreed, ordained.
:Strive make great efforts to achieve or obtain something, struggle or fight vigorously.