Early Monastic Buddhism v1.c8.s3.12

v1.c8.s3.12

The text says further that in course of time, some of these beings happened to be reborn in the mortal world and through meditation and such other practices could visualize their former existences up to their birth in the Brahma world and gave out the view that Mahābrahmā, who had been existing when they were first born, is the creator of all beings and is eternal (sassata), whereas the beings who were born after Mahābrahmā were created by him and hence impermanent (asassata).