Dhātu Sutta [SN 18.9, PTS 2.249]

9.

The Discourse on Elements

196. He was dwelling at Sāvatthī, etc. "What do you think, Rāhula, is the solid element permanent or impermanent?" "Impermanent, venerable sir." Etc. "The liquid element, etc. The heat element... The air element... the space element... Is the consciousness element permanent or impermanent?" "Impermanent, venerable sir." Etc. "Seeing thus, Rāhula, a learned noble disciple becomes disenchanted with the solid element, etc. Becomes disenchanted with the liquid element... Becomes disenchanted with the heat element... Becomes disenchanted with the air element... Becomes disenchanted with the space element... Becomes disenchanted with the consciousness element, etc. he understands." The ninth.