and his saying he does not descend to its entirety until he reaches one of its two ends. he says the sick person from his family who is being treated with talbina in it does not descend to its entirety. he means that he does not descend to be treated with it and keep sipping it until he reaches one of its two ends and says he has recovered or dies.
وقوله لا ينزل برمته حتى يأتي على أحد طرفيه. يقول لا ينزل برمته المريض من أهله الذي يعالج له فيها التلبين. يعني أنه لا ينزل يعالج به ويتعاهد يحسوه حتى يأتي أحد طرفيه يقول برأ أو يموت.