A Veteran on His First Day

A Jewish soldier walks in to see the Slonimer Rebbe on the first day of Sukkos. The Rebbe takes one look at his face and asks, “What mitzvah did you do last night?” The soldier gives a beautiful answer, but the Rebbe shakes his head: “There must be something more than that.” Perhaps the answer is hidden in why a vav is missing when the Torah says Yaakov was “sitting” (יֹשֵׁב) in the tent of Torah.