Is it permissible to make du'a' (supplication) for the deceased with other than the narrated supplications if they are not memorized?
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Question:
May Allah reward you, Honorable Shaykh. This questioner says: If a person does not know the supplication narrated from the Prophet (peace and blessings be upon him), does he make du'a' for the deceased with what he has?
Answer:
Yes, he makes du'a' for him for forgiveness and mercy, and this is something everyone knows, praise be to Allah. He makes du'a' for him for mercy, forgiveness, and deliverance from the Fire. Yes.
May Allah reward you, Honorable Shaykh. This questioner says: If a person does not know the supplication narrated from the Prophet (peace and blessings be upon him), does he make du'a' for the deceased with what he has?
Answer:
Yes, he makes du'a' for him for forgiveness and mercy, and this is something everyone knows, praise be to Allah. He makes du'a' for him for mercy, forgiveness, and deliverance from the Fire. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [3436/587] هل يجوز الدعاء للميت بغير الأدعية المأثورة إذا لم تُحفَظ؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.