What is the evidence that the opening supplication is a recommended practice (sunnah) and not obligatory?
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Question:
Honorable Shaykh, may Allah grant you success, he says: What is the evidence that the opening supplication is a recommended practice (sunnah) and not obligatory?
Answer:
What the Prophet (peace and blessings be upon him) taught the one who was deficient in his prayer is what he taught him. He faced the qiblah and said the takbir, then he recited whatever he could of the Qur'an. He did not order him to recite the opening supplication, which indicates that it is a sunnah (recommended practice). Yes.
Honorable Shaykh, may Allah grant you success, he says: What is the evidence that the opening supplication is a recommended practice (sunnah) and not obligatory?
Answer:
What the Prophet (peace and blessings be upon him) taught the one who was deficient in his prayer is what he taught him. He faced the qiblah and said the takbir, then he recited whatever he could of the Qur'an. He did not order him to recite the opening supplication, which indicates that it is a sunnah (recommended practice). Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [418 -582] ما الدليل على أن دعاء الاستفتاح سُنة وليس بواجب؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.