Bahiya Sutta by Ajahn Brahm

Bāhiya was not a monk. The sutta does not record him giving dāna, nor taking refuge in the Triple Gem, nor keeping any precepts. Moreover, the sutta has no mention at all of Bāhiya ever meditating, let alone reaching a Jhāna. Yet, after receiving a very brief teaching from the Buddha, Bāhiya became fully Enlightened, an Arahant, within seconds!