ונתנו איש כופר נפשו (כי תשא ל:יב)

The Gaon and Chassid Reb Tzvi Yair zt”l, the Rav of Reivitz, used to send money by mail to Reb Aharon of Belz zt”l to Eretz Yisroel before each Yom Tov.  Once, when he was preparing to send money to his beloved Rebbe, his chassidim told him that the money would not arrive until after Yom Tov, so why bother rushing to the post office before Yom Tov?

The Reivitzer Rav replied, “I’m sure that when one sends money to a Rebbe by mail, from the very moment it is being sent – it is considered as if it has already arrived!”