Forgetting to perform Sajdah Sahw in Salaah

Q. If a person made both Salaams and finished Salaah and then remembers that he forgot to make Sajdah Sahw which was necessary, does he have to repeat the entire Salaah?

A.The procedure of performing Sajdah Sahw is as follows:

In the last sitting posture of Salaah, one will recite Tashahhud and make one Salaam to the right. Thereafter, one will perform two Sajdahs and return to the last sitting posture of Salaah. One will recite Tashahhud, Salawaat and Dua before terminating the Salaah with two Salaams, one to the right and then one to the left.

In the enquired case, if one forgot to make Sajdah Sahw after terminating the Salaah, then one may simply go straight into making two Sajdahs and return to the last sitting posture of Salaah. Thereafter, recite Tashahhud, Salawaat and Dua before terminating the Salaah with two Salaams, one to the right and then one to the left.

The performance of Sajdah Sahw in this manner will be valid provided that after terminating the Salaah and before performing Sajdah Sahw, one did not engage in any act that will normally nullify ones Salaah if done during Salaah, for e.g. talking, walking etc.  (Shaami 2/91)