Over at Buddhism Stack exchange and on wikipedia, it lists not going to another teacher as something a sotapanna or one with full confidence in the Buddha would not do.
Among the descriptions of stream-enterer (sotāpanna) is one which says that they is not capable of committing six wrong actions:
Murdering one’s own mother.
Murdering one’s own father.
Murdering an arahant.
Maliciously injuring the Buddha to the point of drawing blood.
Deliberately creating a schism in the monastic community.
Taking another teacher.
However, when I look up the relevant Sutta quote, there is no mention of taking another teacher.
“Mendicants, these five fatal wounds lead to a place of loss, to hell.
Murdering your mother or father or a perfected one; maliciously shedding the blood of a Realized One; and causing a schism in the Saṅgha.
These five fatal wounds lead to a place of loss, to hell.”
I did find this from a google search:
- Tatiya-abhabbaññhànasuttaü- Third on impossibilities.
009.10. Bhikkhus, these six are impossibilities. What six?
It is impossible that one come to right view should. deprive the life of mother, father, of a noble one, with a defiled mind cause the blood of the Thus Gone One to spill, split the Community of bhikkhus, or appoint another, as teacher.
Bhikkhus, these six are impossibilities.
The translation doesn’t match what Sutta Central has, however and no mention of another teacher.
I think it makes sense that one who has full confidence in the Dhamma wouldn’t take another teacher (from another religion), however, what about reading and finding wisdom in other texts and traditions; for example from Tao Te Ching, Bible, etc?