Musannaf Ibn Abi Shaybah

Hazrat Abdullah (may Allah be pleased with him), in the explanation of the verse { فَطَلِّقُوہُنَّ لِعِدَّتِہِنَّ } of the Holy Qur'an, says that divorce should be given to them when they are pure and no intercourse has taken place with them in that period of purity.