R. Shimon b. Gamliel says: Come and see the wealth and grandeur of this guilty kingdom (i.e., Rome). Not one of their legions is idle, but all are active (in conquest) day and night — and, in contrast, (now that its Jews have left), those of Egypt, all of which are idle.
Rabbi Shimon Ben Gamliel Drew a Startling Comparison Between Two
Mekhilta Tractate Vayehi Beshalach 2:29