Bhagavatapurana 2.10.9

2.10.9

ekam ekatarābhāve yadā nopalabhāmahe /
tritayaṃ tatra yo veda sa ātmā svāśrayāśrayaḥ //

9. When (since) we do not find the one in the absence of the other, he who knows (recognises) the three (he who is the subject of the notion of the three) is (really) The Atman who depends upon no other and upon whom everything else depends.