Sampasadaniyasutta 3.6

3.6

Taṃ bhagavā asesamabhijānāti, taṃ bhagavato asesamabhijānato uttari abhiññeyyaṃ natthi, yadabhijānaṃ añño samaṇo vā brāhmaṇo vā bhagavatā bhiyyobhiññataro assa, yadidaṃ kusalesu dhammesu.

The Buddha understands this without exception. There is nothing to be understood beyond this whereby another ascetic or brahmin might be superior in direct knowledge to the Buddha when it comes to skillful qualities.