佛說目連問戒律中五百輕重事經 1.60

1.60

問：「行船船上得結界不？」答：「得。若有沙彌白衣，驅著岸上，然後結界。若不驅出，當障隔著一處，然後結界。結界後，比丘夜不持衣不得入中。」

Question: "When traveling by boat, may one demarcate a sīmā on the boat?" Answer: "One may. If there are śrāmaṇeras or laypeople, drive them onto the shore, and then demarcate the sīmā. If they are not driven out, screen them off in one place, and then demarcate the sīmā. After demarcating the sīmā, a bhikṣu who does not keep his robes with him at night may not enter within it."