What is the ruling on an enslaved woman purchased after her husband divorced her following consummation?

Primary text

If the husband entered into the marriage (consummated it) and then divorced her, the purchaser is not required to perform *istibra'* upon her. This is because the waiting period (*idda*) she undergoes fulfills the requirement for ascertaining purity. If she were manumitted while undergoing *idda*, *istibra'* would not be required. Her purification has already been achieved through her previous marital obligation to the man who was her husband.