Oznayim LeTorah - Why was it necessary for a very strong wind to take away the locust (Shmos 10,19)? Whereas it was only a regular wind that brought the locust to Egypt (10,12)?
The locust were selected just like the frogs. Both displayed a characteristic that showed a lesson to Jews throughout the ages. The locust were pleased to be selected to avenge the opponents of HaShem and His people. Thus, they easily and willingly enabled a regular wind to bring them to Egypt. However, to did not desire to leave their “job” and a strong wind was needed to force them to leave.
The lesson for the Jews is that when one goes to the synagogue or to the Bais haMedrash or to any other mitzvah one should go willingly and with joy. However, when it is time to leave (for example, after prayers), one should refrain oneself from appearing as if one is running away from the mitzvah.
