﴿ نِّعْمَةًۭ مِّنْ عِندِنَا ۚ كَذَٰلِكَ نَجْزِى مَن شَكَرَ ﴾

“as a blessing from Us: thus do We reward all who are grateful.”

as a grace ni‘matan is a verbal noun that is to say in‘āman ‘an act of grace’ from Us. So like that requital do We requite him who gives thanks for Our graces and is a believer or it means him who is a believer in God and His messenger and is obedient to both.