Thank you. As a believer in the G-d of Abraham and the Tanak, can you tell me where G-d says this?
If I remember correctly, during the first century there was a big disagreement among the Jews over whether heaven even existed.
Shabbat Shalom.
If a Jew believes in an after life (not all Jews do - particularly the partially secular ones) the above belief is universal including the Orthodox, Conservative and Reform. My religiously well educated Orthodox son-in-law believes this, as I do (I attend a Reform synagogue), and I'll ask him where the source of this belief lies. My guess that it comes from the Talmud, which includes the rabbinical commentaries on the Bible.
By the way, unless one knows what is in the Talmud, which is twenty times the length of of the Holy Scriptures, one is hardly equipped to challenge the origin or validity of most Jewish religious beliefs.