Chapter on Oaths, Vows, and Expiations

Jamil ibn Salih narrated that he had a female slave in Medina whose menstruation had stopped. He made a vow to Allah سبحانه وتعالى, the Almighty and Glorious, that if she began to menstruate, he would fulfill a certain obligation. Later, he learned that she had already menstruated before he made the vow. He wrote to Abu Abdillah عليه السلام while he was in Medina, asking for guidance. Abu Abdillah عليه السلام replied: "If she had menstruated before the vow, then there is no obligation upon you. However, if she menstruated after the vow, then the vow is binding upon you."