Rashi on Numbers 15:32/רש"י על במדבר ט״ו:ל״ב

1ויהיו ... במדבר וימצאו AND [WHEN THE CHILDREN OF ISRAEL] WERE IN THE DESERT, THEY FOUND [A MAN THAT PICKED UP WOOD ON THE SABBATH DAY] — (This must mean when they first came into the wilderness, and) Scripture is speaking here to the disparagement of the Israelites viz., that they kept the first Sabbath only, for on the second this man came and desecrated it (Sifrei Bamidbar 113).