1.
The Discourse on the Deathless
407.
At Sāvatthī.
"Monks, dwell with minds well established in the four establishments of mindfulness.
Do not let the Deathless be lost to you.
In which four?
Here, monks, a monk dwells observing the body in the body, ardent, fully aware, mindful, having removed covetousness and displeasure regarding the world;
in feelings... etc.
In mind... etc.
He dwells observing mental phenomena in mental phenomena, ardent, fully aware, mindful, having removed covetousness and displeasure regarding the world.
Monks, dwell with minds well established in these four establishments of mindfulness.
Do not let the Deathless be lost to you."
The first.