Praxilla, fr. 750 (Schol. Aristophanes, Thesmophoriazusae 528ff.)

 

“Friend, protect yourself against the scorpion under every stone.”

 

ὑπὸ παντὶ λίθῳ σκορπίον ὦ ἑταῖρε φυλάσσεο

 

 

This is cited by the scholiast when discussing the following passage, quite clearly about politicians (Ar. Thesm. 528-31)

 

τὴν παροιμίαν δ᾽ ἐπαινῶ

τὴν παλαιάν: ὑπὸ λίθῳ γὰρ

παντί νου χρὴ

μὴ δάκῃ ῥητωρ ἀθρεῖν.