Hafs bin Ghyath حفص بن غياث · The Chapters on Marriage

“What differentiates between the lawful and the unlawful is (beating) the Daff and raising the voices (in song) at the time of marriage.”

"I did not know until Zainab burst in on me without permission and she was angry. Then she said: 'O Messenger of Allah, is it enough for you that the young daughter of Abu Bakr waves her hands in front of you?' Then she turned to me, but I ignored her until the Prophet said: 'You should say something to defend yourself.' So I turned on her, (and replied to her) until I saw that her mouth had become dry,…

she heard the Messenger of Allah say: "Do not kill your children secretly, for by the One in Whose Hand is my soul, intercourse with a breastfeeding woman catches up with people when they are riding their horses (in battle) and wrestles them to the ground."