The Tipiṭaka in Three Languages

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Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 812

[812] Therein, what is doubt (vicikicchā)? One doubts, is uncertain about the Teacher (satthā) … rigidity (thambhitatta) of mind (citta), mental perplexity (manovilekha) — this is called doubt.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 3 other places