C. F. Keil and Franz Delitzsch on Leviticus 19:17

Lev 19:17

They were not to cherish hatred in their hearts towards their brother, but to admonish a neighbour, i.e., to tell him openly what they had against him, and reprove him for his conduct, just as Christ teaches His disciples in Mat 18:15-17, and “not to load a sin upon themselves.” חטא עליו נשׁא does not mean to have to bear, or atone for a sin on his account (Onkelos, Knobel, etc.), but, as in Lev 22:9; Num 18:32, to bring sin upon one’s self, which one then has to bear, or atone for; so also in Num 18:22, חטא שׂאת, from which the meaning “to bear,” i.e., atone for sin, or suffer its consequences, was first derived.