In concluding that the Old Testament did not teach the resurrection, the Sadducees had overlooked an important passage in the Torah (Pentateuch). They regarded the Torah as particularly authoritative. Exodus 3:6 taught continued human existence after death. Abraham, Isaac, and Jacob were still alive in Moses" day. The Sadducees not only rejected the resurrection but also life after death. [1] The Jews had a more holistic view of man than most modern westerners do (cf. Genesis 2:7). The Sadducees concluded that if the material part of man died, the whole person ceased to exist. Jesus, who held the same unified view of Prayer of Manasseh , argued that if the immaterial part of man lived the whole person would live. [source][source][source]
The major error of the Sadducees was their mistaken understanding of scriptural revelation. Jesus" final rebuke ( Mark 12:27), unique in the second Gospel, stressed that flaw. [source][source][source]
"If the death of the patriarchs is the last word of their history, there has been a breach of the promises of God guaranteed by the [2] covenant, and of which the formula "the God of Abraham, of Isaac and of Jacob" is the symbol. It is in fidelity to his covenant that God will resurrect the dead." [3][source]