Musannaf Ibn Abi Shaybah 19842 — An umm walad who is freed: how long

Jabir bin Zayd was asked about a man who sets free his concubine (a slave woman with whom he had marital relations) while he is in good health. He said: She will observe a waiting period of three quru' if she menstruates; and if she does not menstruate, her waiting period is three months, if someone else is to marry her.