Why didn't the former emperors have to worship Buddha when they entered the temple?

When Song Taizu (960-976 AD) first arrived at Suoguo Temple, he came to the Buddha statue to burn incense and asked him if he wanted to worship Buddha. The monk in charge of hospitality in the temple said, "Don't worship." Mao asked why. The monk said, "The present Buddha doesn't have to worship the past Buddha." The monk in charge of entertaining has read many books and is eloquent. Although he spoke like a folk zaju actor, he only catered to the emperor's wishes, so Mao smiled and nodded. After the emperor entered the temple, he did not have to worship Buddha, which became a fixed system, and the general culture also felt quite appropriate.