Дигха Никая 1:1172
SUJATOYepi te, bhikkhave, bhavissanti anāgatamaddhānaṁ arahanto sammāsambuddhā, tesampi bhagavantānaṁ etapparamāyeva upaṭṭhākā bhavissanti, seyyathāpi mayhaṁ ānando.
Those who will be perfected ones, fully awakened Buddhas in the future will also have attendants, who at best will be like Ānanda is for me.