Muhammad bin Swa'a محمد بن سواء · The Book of Marriage

"A previously married woman should not be married until her permission has been sought, and a virgin should not be married until her consent is sought." They said: "O Messenger of Allah, how does she give her permission?" He said: "Her permission is if she keeps silent."

"What becomes unlawful (for marriage) through birth becomes unlawful through breast-feeding."

"What becomes unlawful (for marriage) through breast-feeding is that which becomes unlawful through lineage."