Halakhah zu Dewarim 27:18

(2) He also transgresses (Devarim 27:18): "Cursed is he who misleads the blind man on the way," it being known that the intent of Scripture is to curse one who places a stumbling-block before another so that an issur be committed by him, as in the negative commandment (Vayikra 19:14): "And before the blind man do not place a stumbling-block," which we have already explained (Negative Commandments 4) as also falling into this category.