ASSALAMOALAIKUM MUFTI SAHEB IN 4 RAKAT NAMAZ IF AFTER 2 RAKATS I START RECITING DUROOD AFTER ATTAHIYAT BY MISTAKE THEN AFTER REALISING GET UP AND COMPLETE 4 RAKATS IS SAJDAH SAHU BE DONE ALSO IF NOT DONE WHETHER NAMAZ WILL BE RIGHT OR NOT JAZAKALLAH
Answer
(Fatwa: 433/235/D=1432)
If you have recited up to “اللهم صل على محمد” then sajdah sahv shall be wajib, otherwise not.
كما في الدر: فإن زاد عامداً أو ساهياً وجب عليه سجود السهو إذا قال: اللهم صل على محمد على المذهب المفتى به (در مختار مع الشامى: 2/220 ط : زكريا)
Nawafil and sunnan ghair muwakkidah are exempted from it.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband