The Tipiṭaka in Three Languages

Ṭhāniyasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 442

[442] Bhikkhus, from frequently giving attention (manasikāra) to things that are a basis for doubt (vicikicchā), unarisen doubt arises, and doubt that has arisen leads to increase and abundance.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places