Parshas Shlach: Rav Chaim Kanievsky - What Did Bnei Yisroel Do With The Big Grapes?
The Midrash in Shir HaShirm says that the grape cluster that the meraglim brought back from Eretz Yisrael supplied the Bnei Yisrael with wine for the Nesachim of the Korbonos for forty years. Rav Chaim Kanievsky says (in Taama DiKra) that this is the reason why the mitzvah of bringing Nesachim with the Korbonos is written right after the story of the Meraglim.