דְּֽבַר־בְּ֭לִיַּעַל יָצ֣וּק בּ֑וֹ וַאֲשֶׁ֥ר שָׁ֝כַ֗ב לֹא־יוֹסִ֥יף לָקֽוּם׃
이르기를 악한 병이 저에게 들었으니 이제 저가 눕고 다시 일지 못하리라 하오며
Rashbam
השמר לך פן יהיה עם לבבך דבר בליעל, meaning something evil, unworthy. We encounter this word also in Psalms 41,9 דבר בליעל יצוק בו “something baneful has settled in him,” there the meaning is similar to here, i.e. a good deed reluctantly performed, the donor not really believing that the recipient of his tithes is entitled to handouts.