Buddha said, once a day, stay under the tree for the night. You mean sleeping under a tree? Then why are there temples?

Because the ancient India preached by the Buddha belongs to the tropical region, it is ok to sleep under a tree. However, in order to avoid stepping on ants and insects in the rainy season every year, Buddhist monks must practice in March in summer, which is the earliest form of temple. In addition, during the Buddha's lifetime, in order to facilitate the lecture, many kings and elders specially built a refined temple, which was the earliest type of temple.

A night under a tree is to point out that people who practice at home should not covet anywhere to avoid lingering for a long time. Therefore, the Buddha stipulates that even if you live under a tree, you can't stay for more than three days to avoid long-term affection.