What is the ruling on people who say, when someone dies, “O (you) the one in (complete) rest and satisfaction! Come back to your Lord, – well pleased (yourself) and well-pleasing unto Him” [al-Fajr 89:27-28 – interpretation of the meaning]?

Praise be to Allaah. 

This
is not permitted if it is said concerning a specific person, because
it is testifying that he is one of this category.