The Tipiṭaka in Three Languages

Anupakkilesasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 482

[482] Bhikkhus, for one attending unwisely (ayoniso manasikaroto), unarisen sensual desire (kāmacchanda) arises, and sensual desire that has arisen leads to increase and expansion.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places