Albert Barnes Commentary Proverbs 28:21

"To have respect of persons is not good; Neither that a man should transgress for a piece of bread." — Proverbs 28:21 (ASV)

Dishonest partiality leads men who have enslaved themselves to it to transgress, even when the inducement is altogether disproportionate. A “piece of bread” was proverbial at all times as the most extreme point of poverty (compare the marginal reference).