[For ḥajj on behalf of another and hady—] a muḥrim whom an enemy or illness blocks may perform taḥallūl (partial release); he sends a sheep to be slaughtered in the Sacred Precinct on a day he knows so that he performs taḥallūl after slaughter. The dam of iḥṣār is reckoned by [the sheep’s] reaching the ḥaram, not merely by the Day of Sacrifice—unlike the dam of tamattuʾ and qirān.