וְהַנֶּ֜פֶשׁ אֲשֶֽׁר־תַּעֲשֶׂ֣ה ׀ בְּיָ֣ד רָמָ֗ה מִן־הָֽאֶזְרָח֙ וּמִן־הַגֵּ֔ר אֶת־יְהוָ֖ה ה֣וּא מְגַדֵּ֑ף וְנִכְרְתָ֛ה הַנֶּ֥פֶשׁ הַהִ֖וא מִקֶּ֥רֶב עַמָּֽהּ׃
본토 소생이든지 타국인이든지 무릇 짐짓 무엇을 행하면 여호와를 훼방하는 자니 그 백성 중에서 끊쳐질 것이라
Rashi on Numbers
ביד רמה [BUT A PERSON THAT DOETH OUGHT] WITH A HIGH HAND — i.e. with premeditation.
Sforno on Numbers
את ה' הוא מגדף, there is never any atonement for this even if there is complete remorse which is due to the fear of the punishment in store. Only the death of the guilty person can lead to his atonement. This was also the reason why the repentance of the Israelites for the sin of the spies could not be atoned for during their lifetime, although the repentance itself has been documented by the Torah in Deuteronomy 1,45.
Or HaChaim on Numbers
והנפש אשר תעשה ביד רמה, But the person who acts defiantly, etc. This means that if someone deliberately worships idols, G'd considers it as if he had blasphemed against Him. This is why his punishment is that he will be cut off from amongst his people.