DEUTERONOMY 16:16

Three times a year—on the festival of Pesach, on the festival of Shavuot, and on the festival of Sukkot—all your males shall appear before Hashem your God in the place that He will choose. DEUTERONOMY 16:16 (The Israel Bible™)

The above verse commands every Jew to make a pilgrimage to the Beit Hamikdash and appear before Hashem in the Temple on three major festivals: Pesach, Shavuot and Sukkot. In the times of the Temple, Jews would ascend to the Temple Mount to offer sacrifices to Hashem. These three annual pilgrimages ensured that the Jewish people continued to make frequent visits to the Temple and that their connection to Hashem remained strong throughout the year. Pesach, Shavuot and the Feast of Tabernacles remain central to Jewish life in Israel.