With Ambaṭṭha 2.8.2

2.8.2

‘tyāhaṃ mante adhiyāmi sācariyako’ti, tāvatā tvaṃ bhavissasi isi vā isitthāya vā paṭipannoti netaṃ ṭhānaṃ vijjati.

You might imagine that, since you’ve learned their hymns by heart in your own denomination, that makes you a seer or someone on the path to becoming a seer. But that is not possible.