According to the Shafi'is, the most likely night for laylat al-qadr is not the 27th, but either the 21st (tonight) or the 23rd. Their evidence for it being on the 21st is a rigorously authenticated (sahih) hadith in which the Prophet (Allah bless him and give him peace) told his Companions that it would be on a night when he prostrated on water and mud.
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