מדרש על שבועות 4:1

13) (Vayikra 19:14) ("You shall not curse the deaf man), and before the blind man do not place a stumbling-block. And you shall fear your G d; I am the L–rd.") "You shall not curse the deaf man.": This tells me only of a deaf man. Whence are all men included? From (Shemoth 22:7) "and a prince among your people you shall not curse." If so, why is "deaf man" written? Just as a deaf man is distinctive in being alive, (so all living men are included) — to exclude a dead man, who is not alive.