The Iq'a'at reported from Ibn 'Abbas in the places of sitting
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Question:
Honorable Shaykh, may Allah grant you success. The iq'a'at that was reported from Ibn 'Abbas (may Allah be pleased with him) as his practice in prayer: is it prescribed in the first or last tashahhud, or between the two prostrations?
Answer:
It is permissible in every sitting, but one should not make it a habit. If one does it occasionally, it is not permissible; as for making it a habit, it is not permissible.
Honorable Shaykh, may Allah grant you success. The iq'a'at that was reported from Ibn 'Abbas (may Allah be pleased with him) as his practice in prayer: is it prescribed in the first or last tashahhud, or between the two prostrations?
Answer:
It is permissible in every sitting, but one should not make it a habit. If one does it occasionally, it is not permissible; as for making it a habit, it is not permissible.
Source
قناة «العلامة الدكتور صالح الفوزان»، 141/27 شرح زاد المستقنع/ صالح الفوزان — youtube.com (1:12:25)
The Arabic text is a machine transcription of the audio recording.