Regulations concerning prostrations for forgetfulness in Salah
Forgetfulness (Sahw) prostrations (sujud) are necessary (wajib) to perform for the omission of any of the essential (wajib) actions of the prayer if done inadvertently. Sajda Sahw is thus optimally performed after one salam to the right at the end of the prayer (Salah). It consists of two prostrations and after them, one repeats the final sitting in full: reciting the tashahhud, and the recitation of the other supplications before ending the prayer with two salams as per usual.
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