Musannaf Ibn Abi Shayba 10:1

Abu Abd al-Rahman Baqi ibn Makhlad narrated to us, he said: Abu Bakr Abdullah ibn Muhammad ibn Abi Shayba narrated to us, he said: Abdullah ibn Idris, Waki’, Hafs, and Mu’awiyah narrated to us, from al-A’mash, from Malik ibn al-Harith, from Abd al-Rahman ibn Yazid, from Abdullah regarding [the verse]: "Divorce them for their waiting period," he said: "In a state of purity without sexual intercourse."