Bicāraṇāhenavedanānavedanāneaṅaayū

Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 460

[460] The four establishments of mindfulness (satipaṭṭhāna): Here a bhikkhu dwells contemplating the body in the body; he dwells contemplating feelings in feelings (vedanā); he dwells contemplating the mind in the mind (citta); he dwells contemplating dhammas in dhammas.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 35 · Section 431 — Satipaṭṭhānavibhaṅgasuttantabhājanīya