(172) باب مَا جَاءَ فِي سَجْدَتَىِ السَّهْوِ بَعْدَ السَّلاَمِ وَالْكَلاَمِ .
Abdullah bin Masud narrated:
"The Prophet (S) prayed five (Rakah) for Zuhr, so it was said to him: 'Has the prayer been added to, or have you merely forgotten?' So he (S) performed two prostrations after he had said the Salam." (FR)
Reference (FR): Jami` at-Tirmidhi 392 (FR)
In-book reference (FR): Book 2, Hadith 245 (FR)
English translation (FR): Vol. 1, Book 2, Hadith 392 (FR)