Sūtra 3·2·40
वाचि यमो व्रते
vāci yamo vrate
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The affix khac comes after the verb yam ‘to curb’ when the word vāk ‘speech’ is in composition with it as object, and the sense indicated is that of a vow.
Padapāṭha vāci yamaḥ vrateवाचि यमः व्रते
