四分律刪補隨機羯磨 2.203

2.203

(In the Vinaya: "A bhikṣu took seven days' leave to go beyond the boundary and was earnestly detained by his parents, elder brothers, or sisters, thereby exceeding the period; or the water or land routes were cut off, so that he exceeded the limit. The Buddha said: 'He does not lose his rains year.'" The Mahāsāṃghika-vinaya states: "If one takes leave and is on the road, one must not make detours; once the business is completed that day, one must immediately return to one's original boundary.")