Rashi on Leviticus 24:15/רש"י על ויקרא כ״ד:ט״ו

1ונשא חטאו [WHOSOEVER EXECRATETH HIS GOD] SHALL BEAR HIS SIN — i. e. shall be punished with excision if there was no legal warning preceding the offence (Sifra, Emor, Chapter 19 6; cf. Rashi on Leviticus 20:27).