Ādittapariyāyasutta

sn35.235:10.1 Forget mutilating the tongue faculty with a sharp razor, burning, blazing, and glowing!

sn35.235:10.2 I’d better focus on the fact that

sn35.235:10.3 the tongue, tastes, tongue consciousness, and tongue contact are impermanent. And the painful, pleasant, or neutral feeling that arises dependent on tongue contact is also impermanent.