The Tipiṭaka in Three Languages

Anupakkilesasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 484

[484] …unarisen dullness and drowsiness (thīna-middha) arises, and arisen dullness and drowsiness leads to increase and expansion.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places