Saṃyutta Nikāya 52 2. Dutiyavagga 15. Ṭhānasutta “Imesañca panāhaṃ, āvuso, catunnaṃ satipaṭṭhānānaṃ bhāvitattā bahulīkatattā ṭhānañca ṭhānato aṭṭhānañca aṭṭhānato yathābhūtaṃ pajānāmī”ti. Pañcamaṃ.