Digha Nikaya (Coleção dos Discursos Longos) 1:1005
SUJATOImesu kho, ānanda, dvīsu kālesu ativiya tathāgatassa kāyo parisuddho hoti chavivaṇṇo pariyodāto.
These are the are two times when the color of the Realized One’s skin becomes extra pure and bright.