Ādittapariyāyasutta

sn35.235:9.1 Forget mutilating the nose faculty with a sharp nail cutter, burning, blazing, and glowing!

sn35.235:9.2 I’d better focus on the fact that

sn35.235:9.3 the nose, smells, nose consciousness, and nose contact are impermanent. And the painful, pleasant, or neutral feeling that arises dependent on nose contact is also impermanent.