There are many references to the Olam Habah in the Torah. One is Shabbat.
Shabbat literally is the world to come. "And on the seventh day He rested".
Another is the Shema: "And you shall speak of them when you sit in your
house, when you walk by the way, when you lie down, and when you rise up".
Uvkumecha, "when you rise up", refers to the resurrection, which is
B'reishit, the beginning, of the age to come.
To understand the world to come, is to understand Messiah. It was not
G-d's plan to reveal Messiah to Israel in explicit terms. He has
challenged us through the ages to search Torah, and our hearts, and find
Him. In the day that Israel at last finds Mashiach, He will surely come to
redeem us, and establish His kingdom forever.
Michael Stepakoff, esq.