Is it permissible to use the phrase "peace be upon him" for al-Mahdi?
Machine translationRead the Arabic original
Question:
May Allah reward you, Honorable Shaykh. A questioner says: When the mention of al-Mahdi came up, you said "peace be upon him." Is he considered in the same position as a prophet, or is this merely for honor?
Answer:
It is permissible to send peace upon other than the prophets; it is said that one prays for them. The Prophet (peace and blessings be upon him) said, "O Allah, send peace upon the family of Abu Ufayah." It is permissible to pray for other than the prophets and to send peace upon other than the prophets, but one does not make that a constant habit, one does not make that a constant habit as one does with the prophets. Rather, if it is said sometimes, there is no harm. Yes.
May Allah reward you, Honorable Shaykh. A questioner says: When the mention of al-Mahdi came up, you said "peace be upon him." Is he considered in the same position as a prophet, or is this merely for honor?
Answer:
It is permissible to send peace upon other than the prophets; it is said that one prays for them. The Prophet (peace and blessings be upon him) said, "O Allah, send peace upon the family of Abu Ufayah." It is permissible to pray for other than the prophets and to send peace upon other than the prophets, but one does not make that a constant habit, one does not make that a constant habit as one does with the prophets. Rather, if it is said sometimes, there is no harm. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [99 -560] هل يجوز أن يقال في المهدي لفظة "عليه السلام"؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.