Ayonisomanasikārasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 488

[488] …the unarisen equanimity factor of awakening (bojjhaṅga) arises, and the arisen equanimity factor of awakening goes to fulfillment by development.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places

Vol. 19 · Section 447 — Ayonisomanasikārasutta
Vol. 19 · Section 443 — Ṭhāniyasutta