Clarification of expressions that must never be used of Allah Most High, for they detract from His majesty:

Allah—glorified and exalted—is tremendous and must be treated with the utmost reverence. For that reason, certain expressions are prohibited out of respect for Him, and the texts contain explicit warnings against them.

1- One such expression is to say, “Peace be upon Allah.” The word salām (peace and safety) is a supplication for the one greeted, asking that he be protected from harm, whereas protection is sought from Allah, not for Him. He is the One who is called upon; supplication is directed to Him, not offered on His behalf. He is the Self-Sufficient, to Him belongs whatever is in the heavens and the earth. He is free of every defect and imperfection, the Giver and Bestower of safety. He is al-Salām, and from Him comes all peace.

In the Ṣaḥīḥ it is narrated from Ibn Masʿūd, who said, “When we were with the Messenger…"