When beginning within a sūrah rather than at its first verse, the book allows a choice about reciting the basmalah. The same discussion extends to beginning from within Sūrat Barāʾah.
For example, someone reviewing a memorized passage starting with a later verse is not opening a new sūrah. One should distinguish these cases before applying the pausing and joining rules.
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Starting from within a sūrah
Istiʿādhah, Basmalah and the Rules of Joining and Pausing
When beginning within a sūrah rather than at its first verse, the book allows a choice about reciting the basmalah. The same discussion extends to beginning from within Sūrat Barāʾah.
For example, someone reviewing a memorized passage starting with a later verse is not opening a new sūrah. One should distinguish these cases before applying the pausing and joining rules.