If one did melacha during bein hashemashot (b'dieved), may one benefit from it?
Synopsis
The Mishnah Berurah rules strictly that b'dieved one may not benefit, treating it like Shabbat itself. The Biur Halacha distinguishes: where there is a dispute among poskim about the exact time of bein hashemashot, b'dieved one may be lenient.
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