Deuteronomy 14:19
14:19 and any winged thing on the ground are impure to you – they may not be eaten.
Deuteronomy 23:9
Purity in Personal Hygiene
23:9 When you go out as an army against your enemies, guard yourselves against anything impure.
Deuteronomy 14:10
14:10 but whatever does not have fins and scales you may not eat; it is ritually impure to you.