Parallel
Matthew 12:34
Nestle 1904 Greek New Testament · Berean Standard Bible
γεννήματα ἐχιδνῶν πῶς δύνασθε ἀγαθὰ λαλεῖν πονηροὶ ὄντες ἐκ γὰρ τοῦ περισσεύματος τῆς καρδίας τὸ στόμα λαλεῖ
You brood of vipers, how can you who are evil say anything good? For out of the overflow of the heart the mouth speaks.