The Long Āgama Sūtra 6.7

6.7

「時，王出家過七日已，彼金輪寶忽然不現，其典輪者往白王言：『大王！當知今者輪寶忽然不現。』時王不悅，即往詣堅固念王所，到已白王：『父王！當知今者輪寶忽然不現。』時，堅固念王報其子曰：『汝勿懷憂以為不悅，此金輪寶者非汝父產，汝但勤行聖王正法，行正法已，於十五日月滿時，沐浴香湯，婇女圍遶，昇正法殿上，金輪神寶自然當現，輪有千輻，光色具足，天匠所造，非世所有。』

“Seven days after Dṛdhasamādāna left home, the king’s golden wheel treasure suddenly disappeared. The administrator of the wheel went to the king and said, ‘Great king, you should know that the wheel treasure has suddenly disappeared!’

“The king was displeased and went to Dṛdhasamādāna. After arriving, he said to [the former] king, ‘Father king, you should know that the wheel treasure has suddenly disappeared.’

“King Dṛdhasamādāna replied to his son, ‘Don’t feel sad or displeased by it. The golden wheel treasure wasn’t your father’s property. Simply endeavor to enact the correct teaching of a noble king. After practicing that correct teaching, then bathe yourself in fragrant water surrounded by your concubines on the fifteenth-day full moon and ascend the Hall of the Correct Teaching. The miraculous treasure of the golden wheel will spontaneously appear. The wheel will have a thousand spokes and possess a radiant color. It’s made by a heavenly craftsman. It isn’t something that belongs to this world.’