(174) باب مَا جَاءَ فِي الرَّجُلِ يُصَلِّي فَيَشُكُّ فِي الزِّيَادَةِ وَالنُّقْصَانِ
Iyad bin Hilal said:
"I said to Abu Sa'eed: 'One of us performs Salat and we do not know how (much) we prayed.' So he said: 'Allah's Messenger (S) said: "When one of you performs Salat and he does now know how (much) he prayed then let him perform two prostrations while he is sitting." (ES)
Reference (ES): Jami` at-Tirmidhi 396 (ES)
In-book reference (ES): Book 2, Hadith 249 (ES)
English translation (ES): Vol. 1, Book 2, Hadith 396 (ES)