English translation
2319. It was reported from Sa'eed bin 'Amr, meaning Ibn Sa'eed bin Al-'Ās, from Ibn 'Umar, who said: "Allāh's Messenger ﷺ said: 'We are an unlettered nation, we cannot write nor calculate. The month is thus, and thus, and thus.'" (One of the narrators) Sulaimān closed one of his fingers the third time, indicating that a month is twenty-nine days, and (sometimes) thirty. (Sahīh)
