長阿含經 26.p30

26.p30

The Buddha said, “If not one of the priests who possess the three insights have seen Brahmā’s Heaven, none of the previous teachers of the priests who possess the three Vedas have seen Brahmā’s Heaven, and even the great sages of antiquity like the priest Aṣṭaka didn’t see Brahmā’s Heaven, we should know that the teachings of the priests who possess the three Vedas are untrue.”