Q. During the last sitting posture of a 4 Rakaat Salaah, if one stands up after reciting Tashhahhud and then remembers that one has stood up for a 5th Rakaat of Salaah, what should one do?
A. In the enquired case, one should return to the sitting posture of the 4th Rakaat of Salaah, make Sajdah Sahw and complete the remainder of the Salaah by reciting Tashhahhud, Durood, Dua and making Salaam. In this way, the Salaah performed remains valid. (Maraaqil Falaah 1/181)
Allah Ta’ala Knows Best
Mufti Ismaeel Bassa