C. F. Keil and Franz Delitzsch on Leviticus 19:14

Lev 19:14

They were not to do an injury to an infirm person: neither to ridicule or curse the deaf, who could not hear the ridicule or curse, and therefore could not defend himself (Psa 38:15); nor “to put a stumblingblock before the blind,” i.e., to put anything in his way over which he might stumble and fall (compare Deu 27:18, where a curse is pronounced upon the man who should lead the blind astray). But they were to “fear before God,” who hears, and sees, and will punish every act of wrong (cf. Lev 19:32, Lev 25:17, Lev 25:36, Lev 25:43).