Uthman ibn Abi Shaybah and Ishaq ibn Ibrahim narrated to us, both from Jarir ibn Abd al-Hamid. And Ishaq ibn Ibrahim narrated to us, saying: Isa ibn Yunus informed us. And Abu Sa'id al-Ashajj narrated to me, saying: Waki' narrated to us. And Ubayd Allah ibn Mu'adh narrated it to us, saying: my father narrated to us, saying: Shu'bah ibn al-Hajjaj narrated to us. All of them narrated from al-A'mash with this chain of transmission. He said in the hadith of Waki': "Indeed, the creation of one of you is gathered in his mother's womb for forty nights." And he said in the hadith of Mu'adh, from Shu'bah: "Forty nights, forty days." As for in the hadith of Jarir and Isa: "Forty days."