This is not permitted, this is like calling upon one of the attributes of Allaah).
Ruling on saying “Ya Rahmat Allaah (O Mercy of Allaah)”
Question 21150
What is the ruling on what some people say, “Ya Rahmat Allaah (O Mercy of Allaah)”?
Answer
Praise be to Allah, and blessings and peace be upon the Messenger of Allah:
Tawhid (Divine Unity)
Source:
From Fatawa Samahat al-Shakh Muhammad ibn Ibraheem (may Allah have mercy on him) 1/117
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