That is Hamas claim, which is baseless, both legally or historicaly. Now tell me on what base is Palestine historic land was on Judea? Palestine nation was non existent yet before 1988, leave alone historic land on the Palestine region.
No you are wrong, Israel did not capture West Bank from Palestine, but got rid Jordan from the West Bank when she defended herself from Jordan and Arab attacks in 1967 and capture it to be under her military control, and it was legal because West Bank was land of no one, Jordan was annexing it illegally. Later on based on Oslo accord both parties agreed to share the west bank into 3 region: A,B & C, where A&B administered by Palestine Authority and C administered by Israel.
Please learn history, not propaganda (from Hamas).
In June 1967, the West Bank and
East Jerusalem were captured by Israel as a result of the
Six-Day War. With the exception of East Jerusalem and the former
Israeli-Jordanian no man's land, the
West Bank was not annexed by Israel; it remained under Israeli military control until 1982.
en.wikipedia.org