Deuteronomy 14:19

14:19 and any winged thing on the ground are impure to you – they may not be eaten. ¹ 

Deuteronomy 23:9

Purity in Personal Hygiene

23:9 When you go out as an army against your enemies, guard yourselves against anything impure. ² 

Deuteronomy 14:10

14:10 but whatever does not have fins and scales you may not eat; it is ritually impure to you.

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¹ tc The MT reads the Niphal (passive) for expected Qal (“you [plural] must not eat”); cf. Smr, LXX. However, the harder reading should stand.

² tn Heb “evil.” The context makes clear that this is a matter of ritual impurity, not moral impurity, so it is “evil” in the sense that it disbars one from certain religious activity.