صحیح ابن حبان
Ibn Hibban
كتاب الصلاة
Book of Prayer
باب سجود السهو - ذكر البيان بأن الأمر بسجدتي السهو للتحري في شكه في الصلاة إنما أمر بها بعد السلام لا قبل
Chapter on Prostration of Forgetfulness - Clarification that the instruction for two prostrations of forgetfulness due to doubt is after salam, not before
1 hadith
Hadith 2659
Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings of Allah be upon him): "When a person has doubt regarding his prayer, he should try to estimate the correct situation, then say the salam, and then perform two prostrations of forgetfulness (sajda sahw)."