1) What did people use to trim their beards in Prophet Muhammad's time? (SAWS)
2) Is using a trimmer machine allowed? Trimmer also removes all the hair when it is used

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1) At the time of rasul, there was no trimmer. They used to trim with scissors.
2) Don’t use zero. Shaving should be such that at least from a distance of 40 steps, one can see the beard hair