صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب السهو فى الصلاةChapters on Forgetfulness in Prayer
(429) بَابُ ذِكْرِ الْقِيَامِ مِنَ الرَّكْعَتَيْنِ قَبْلَ الْجُلُوسِ سَاهِيًا،The chapter on standing up after two units before sitting out of forgetfulness
Hadith Q1029
وَالْمُضِيِّ فِي الصَّلَاةِ إِذَا اسْتَوَى الْمُصَلِّي قَائِمًا، وَإِيجَابِ سَجْدَتَيِ السَّهْوِ عَلَى فَاعِلِهِ
And when the person praying stands up straight, he should continue the prayer; two prostrations of forgetfulness are obligatory upon such a person.
