The Long Āgama Sūtra 6.13

6.13

「其王久治世已，時，金輪寶即於虛空忽離本處，其典輪者速往白王：『大王！當知今者輪寶離於本處。』時，王聞已即自念言：『我曾於先宿耆舊所聞，若轉輪聖王輪寶移者，王壽未幾。我今已受人中福樂，宜更方便受天福樂，當立太子領四天下，別封一邑與下髮師，令下鬚髮，服三法衣，出家修道。』

“After that king had ruled the world for a long time, the golden wheel treasure then suddenly departed from its place in the sky. The administrator of the wheel quickly went to the king and said, ‘Great king, you should know that the wheel treasure just left its place!’

“Upon hearing this, the king then thought to himself, ‘I’ve heard from the elders in the past that if the wheel treasure goes away, the king’s life won’t last much longer. Now, I’ve experienced the pleasures of merit among humans. It would be fitting to pursue the way to experience the pleasure of merits in heaven. I’ll install a crowned prince to receive the four continents under heaven. I’ll bestow a particular town to a barber and have him cut my hair and beard. Then, I’ll put on the three Dharma robes, and leave home to cultivate the path.’