כִּ֤י דְבַר־יְהוָה֙ בָּזָ֔ה וְאֶת־מִצְוָת֖וֹ הֵפַ֑ר הִכָּרֵ֧ת ׀ תִּכָּרֵ֛ת הַנֶּ֥פֶשׁ הַהִ֖וא עֲוֺנָ֥ה בָֽהּ׃ (פ)
Потому что он презрел слово Господне и нарушил заповедь Его; эта душа будет полностью истреблена, его беззаконие будет на нем.
Tanya
And all the more so, in a fortiori inference, one who stays idle while being able to perform some positive mitzvah and does not, such as one who is able to engage with Torah and does not, about that person our sages used the verse "the word of Hashem etc, cut-off certainly cut-off etc" (Ex. 15:31) (see Sanhedrin 90b) and it is obvious that one is called wicked - even more wicked than one who transgressed a rabbinic prohibition!