The ruling on leading prayer for one who substitutes the letter ḍād with ḍāʾ and sīn with ṣād?
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The questioner : Brother, this is it.
The Shaykh : No, my intention is that some letters are not excepted, not some of the vowels.
The questioner : There is a letter from the difficult ones; the ḍād means he pronounces it instead of the ḍād, he pronounces it as a ḍād.
The Shaykh : If he substitutes the ḍād with the ḍāʾ.
The questioner : And likewise the sīn with the ṣād.
The Shaykh : Now, substituting the letter *dha* with *za*, such as if one says[Al-Fatihah 1:7] instead of the correct recitation, that is valid due to the difficulty of distinguishing between them, especially for the general public.
The Shaykh : No, my intention is that some letters are not excepted, not some of the vowels.
The questioner : There is a letter from the difficult ones; the ḍād means he pronounces it instead of the ḍād, he pronounces it as a ḍād.
The Shaykh : If he substitutes the ḍād with the ḍāʾ.
The questioner : And likewise the sīn with the ṣād.
The Shaykh : Now, substituting the letter *dha* with *za*, such as if one says
not of those who have evoked [Your] anger
غَيْرِ الْمَغْضُوبِ عَلَيْهِمْ
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 3307حكم إمامة من يبدل الضاد بالظاء والسين بالصاد؟📔 الشرح الممتع على زاد المستقنع - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.