LXX Deut 29:19

καὶ ἔσται ἐὰν ἀκούση τὰ ῥήματα τῆς ἀρᾶς ταύτης, καὶ ἐπιφημίσηται ἐν τῇ καρδίᾳ αὐτοῦ λέγων Ὅσιά μοι γένοιτο, ὅτι ἐν τῇ ἀποπλανήσει τῆς καρδίας μου πορεύσομαι, ἵνα μὴ συναπολέσῃ ὁ ἁμαρτωλὸς τὸν ἀναμάρτητον·

because when such a person hears the words of this oath, he invokes a blessing on himself, saying, ‘I will have peace, even though I walk in the stubbornness of my own heart.’ This will bring disaster on the watered land as well as the dry.