Al-Hasan said: They stood in prayer until their feet became swollen, whereupon it was revealed: “He knows that you will not be able to keep count of it”—that is, you will not be able to determine it precisely. Muqatil said: A man would pray throughout the entire night, fearing that he might fail to attain what he had been commanded to do in standing for prayer. So He said: “He knows that you will not be able to keep count of it”—that is, you will not be able to determine it precisely.
“Thus, He turned to you in mercy”: that is, He returned to you with pardon and relief. “So recite whatever is easy for you of the Quran,” meaning in the prayer. Al-Hasan said: This refers to the Maghrib and Isha prayers.
Qays ibn Abi Hazim said: I prayed behind Ibn Abbas in Basra. In the first rak'ah, he recited al-Fatihah and the first verse of al-Baqarah. [Then, in the second, he stood and recited al-Fatihah and the second verse of al-Baqarah] (1), then bowed. When he had finished, he turned to us and said: Allah, the Exalted, says: “So recite whatever is easy [of it]” (2).
Abd al-Wahid al-Malihi informed us; Abu Mansur al-Sam'ani informed us; Abu Ja'far al-Rayani narrated to us; Humayd ibn Zanjawayh narrated to us; Uthman ibn Abi Salih narrated to us; Ibn Lahi'ah narrated to us; Humayd ibn Mikhraq narrated to me, from Anas ibn Malik, that he heard the Messenger of Allah, may Allah bless him and grant him peace, say: “Whoever recites fifty verses in a day or a night will not be recorded among the heedless. Whoever recites one hundred verses will be recorded among the devoutly obedient. Whoever recites two hundred verses, the Quran will not contend against him on the Day of Resurrection. And whoever recites five hundred verses will have a qintar—a vast measure—of reward recorded for him.” (3)
Isma'il ibn Abd al-Qahir informed us; Abd al-Ghafir ibn Muhammad informed us; Muhammad ibn Isa informed us; Ibrahim ibn Muhammad ibn Sufyan narrated to us; Muslim ibn al-Hajjaj narrated to me; al-Qasim ibn Zakariyya narrated to us; Ubayd Allah ibn Musa narrated to us, from Shayban, from Yahya [ibn Kathir], from Muhammad [Abd Allah] (4) ibn Abd al-Rahman, the client of Banu Zuhrah, from Abu Salamah, from Abd Allah ibn Amr, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: “Recite the Quran once every month.” He said: I replied, “I find that I have the strength.” He said: “Then recite it every [twenty] (5) nights.” He said: I replied, “I find that I have the strength.” He said: “Then recite it every seven days, and do not exceed that.” (6)