藥師經疏 1.60

1.60

經。一切至清淨　三釋。身口意行無不清淨者。夫煩惱未盡。三業有漏所見不明。所說不定可生疑惑。如來煩惱習盡。三業清淨所見分明。說必楷定。是故不疑。

Sūtra: “All [...] pure.”
Third: Explaining. That the bodily, verbal, and mental actions are completely pure means: when afflictions are not exhausted, the three karmas have outflows, perception is not clear, and what is spoken is not definitive, so doubt may arise. For the Tathāgata, the afflictions and residual impressions are exhausted, the three karmas are pure, perception is distinct, and his speech is bound to be definitive; therefore, there is no doubt.