MN 108 (Gopakamoggallana Sutta)

“Is there, Master Ananda, any single bhikkhu who was appointed by Master Gotama thus: ‘He will be your refuge when I am gone,’ and whom you now have recourse to?”

“There is no single bhikkhu, brahmin, who was appointed by the Blessed One who knows and sees, accomplished and fully enlightened, thus: ‘He will be your refuge when I am gone,’ and whom we now have recourse to.”

“But is there, Master Ananda, any single bhikkhu who has been chosen by the Sangha and appointed by a number of elder bhikkhus thus: ‘He will be our refuge after the Blessed One has gone,’ and whom you now have recourse to?”

“There is no single bhikkhu, brahmin, who has been chosen by the Sangha and appointed by a number of elder bhikkhus thus: ‘He will be our refuge after the Blessed One has gone,’ and whom we now have recourse to.”