The line 'She dwells with Beauty—Beauty that must die' - occurs in Keats’-

‘Ode on Melancholy’ is one of five odes composed by English poet John Keats. The next lines are- ‘She dwells with Beauty—Beauty that must dieAnd Joy, whose hand is ever at his lipsBidding adieu; and aching Pleasure nighTurning to poison while the bee-mouth sips.’