The Hebrews inherited the idea of resurrection from the Persians (following the defeat of Babylon). The idea did not really take off until the Jews (as they had now become known as) inherited the idea of a "soul" and "Consciousness in death" from the Greeks.
Hence the only place in their Scriptures where resurrection is mentioned is in Daniel. That Book, of course, was prepared the the 2nd century BCE, following the absorption of those ideas from Persia and Greece.
All of this took place in a much larger context, in which the Jews took on the idea of "Last Days"; "War in heaven"; Evil Leader of fallen angels, and so forth.
All these features might not appear strange for some today, but they were extremely novel at the time.
The Saddusees only ever accepted the Torah, and since it does not speak of a resurrection, so neither did the Sadducees. They were true to the Scriptures, whereas the Pharisees were more generous and accepted other writings as authoritative.
Doug
An Afterthought: Is this idea of resurrection part of a denial of Death?