Undoubtedly, he is among Our most dignified fully believing devotees.
He is one of our believing servants.
he was one of Our believing worshipers
Surely he was of Our believing servants
That he truly is from Our worshippers/slaves , the believers
Noah is indeed one of My believing servants
He is indeed one of Our high ranking, firmly believing bondmen
He was, surely, one of our believing servants
He was indeed of Our servants blessed with (perfect) faith
He was surely (one) of Our believing servants
Verily, he (Nooh (Noah) ) was one of Our believing slaves