It seems like every image I've ever seen drawn (or acted) of the Jews' slavery in Egypt involves them being whipped by Egyptians. The Torah says that the Jewish foremen were stricken as their underlings weren't meeting the quota, but where did everyone seem to take for granted that whips came into the picture per se? Are there Jewish textual sources? Some influential painting perhaps? Archaeological or parallel historic sources?
We see when Moshe went out he saw the Mitzri hitting and whipping a Jew (Malkeihu V'Rodehu)
see translation of Malkehu = lashing here