5.
The Discourse on the Establishment of Mindfulness
370.
"And what, monks, is the path leading to the unconditioned?
The four establishments of mindfulness.
This is called, monks, the path leading to the unconditioned, etc.
The fifth.
Satipaṭṭhāna Sutta [SN 43.5, PTS 4.360]
Also known as: Satipaṭṭhānasuttaṃ