The Long Āgama Sūtra 4.11

4.11

阿難尋來，至世尊所，頭面禮足，在一面住，而白佛言：「今觀如來顏色勝常，諸根寂定。住何思惟，容色乃爾？」

Ānanda quickly came to the Bhagavān. He bowed his head at his feet, stood to one side, and said, “I see that the Bhagavān is looking better than usual. His faculties are peaceful and settled. What has he been contemplating for his appearance to be like this?”