صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب السهو فى الصلاةChapters on Forgetfulness in Prayer
(433) بَابُ إِيجَابِ سَجْدَتَيِ السَّهْوِ عَلَى الْمُسَلِّمِ قَبْلَ الْفَرَاغِ مِنَ الصَّلَاةِ سَاهِيًا،The chapter on the obligation of two prostrations of forgetfulness before finishing the prayer if one forgets
Hadith 1039
وَالنَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِخَيْبَرَ ، وَقَدِ اسْتَخْلَفَ عَلَى الْمَدِينَةِ سِبَاعَ بْنَ عُرْفُطَةَ الْغِفَارِيَّ
Iraq bin Malik narrates from Sayyiduna Abu Hurairah (may Allah be pleased with him) that he said: I came to Madinah at a time when the Noble Prophet (peace and blessings be upon him) was in Khaybar—and the Prophet (peace and blessings be upon him) had appointed Sayyiduna Siba’ bin ‘Arfatah (may Allah be pleased with him) as his deputy in Madinah Munawwarah. (The author says:) I have mentioned this narration at another place as well, and regarding Sayyiduna Abu Hurairah’s (may Allah be pleased with him) presence in the noble service of the Prophet (peace and blessings be upon him) at Khaybar, I have narrated it in the Book of Jihad.
