I asked him about a man who purchased a bondwoman and her previous owner had not had relations with her. Should he still observe an istibra' (waiting period) for her womb? Imam (as) said: "Yes." I asked: "What about a bondwoman who has not yet menstruated? What should he do with her?" Imam (as) said: "Her matter is more severe. If he has relations with her, he must not ejaculate until it becomes clear whether she is pregnant or not." I asked: "How long will it take for this to become clear?" Imam (as) said: "In forty-five nights."