A wandering monk does not sleep three nights under the same mulberry tree, for fear of growing attached.
Tips
culture
The Buddhist precept 桑下不三宿 ('do not sleep three nights beneath the same mulberry') comes from the 《四十二章经》 — a reminder for itinerant monks to avoid forming attachments. The 宿 is read xiǔ as a night-counter, not sù.