Dighanikaya 18.291

18.291

Taṃ kiṃ maññati bhavanti iminā kevalaṃ vessavaṇaṃ pucchati, na panassa evarūpo satthā nāhosīti vā na bhavissatīti vā laddhi atthi. Sabbabuddhānañhi abhisamaye viseso natthi.

"What does your lordship think of this?": by this he merely asks Vessavaṇa, but he does not hold the view that "such a Teacher has not existed or will not exist". For there is no distinction in the realization of all Buddhas.