The ruling on making one of the opinions prescribed
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Question : If a person were to say that he does this once and that once.
Answer : No. If he were to say this to avoid the disagreement, first, the texts do not indicate this until the disagreement is established. And if the scholars' opinions do not have a share of consideration, the people of knowledge remain excused for what they held. However, one opinion is not made prescribed. This issue is not like the sitting for rest, which can be attributed to one state rather than another, as will come to us, if Allah wills. Rather, this is a characteristic: either this or that. Yes.
Answer : No. If he were to say this to avoid the disagreement, first, the texts do not indicate this until the disagreement is established. And if the scholars' opinions do not have a share of consideration, the people of knowledge remain excused for what they held. However, one opinion is not made prescribed. This issue is not like the sitting for rest, which can be attributed to one state rather than another, as will come to us, if Allah wills. Rather, this is a characteristic: either this or that. Yes.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 1325هل يصح أن يسجد المصلي مرة...📔 الشرح الممتع على زاد المستقنع - ابن عثيمين - مشروع كبار العلماء — youtube.com
The Arabic text is a machine transcription of the audio recording.