Rashi on Numbers 15:30/רש"י על במדבר ט״ו:ל׳

1ביד רמה [BUT A PERSON THAT DOETH OUGHT] WITH A HIGH HAND — i.e. with premeditation.

2מגדף is synonymous with מחרף HE REVILETH, as in (Ezekiel 5:15) “it shall be a reproach (חרפה) and a reviling (גדופה) (Isaiah 37:6) “the servants of the king of Assyria have reviled (גדפו)”. Further, our Rabbis derived from here the law that he who blasphemes the name of the Lord is liable to excision (Keritot 7b).