Mas’ala 502مختصر المزنيShafi'ivol. 1, p. 126vol. 1, p. 126 ثُمَّ يَرْكَعُ بِقَدْرِ سَبْعِينَ آيَةً مِنْ الْبَقَرَةِ، Read the whole chapterCopy with source On the map: PrayerCompare