Mas’ala 261مختصر المزنيShafi'ivol. 1, p. 110vol. 1, p. 110 فَلَا سَهْوَ عَلَيْهِ وَإِنْ اسْتَيْقَنَ السَّهْوَ، Read the whole chapterCopy with source On the map: PrayerCompare