It is like this: Israel accepted the UN 1947 partition agreement. Palestinian leaders rejected it, without offering a counter-proposal.

https://www.jpost.com/middle-east/abbas-arabs-erred-in-rejecting-1947-partition-plan/article-243669

“At the time, 1947, there was [General Assembly] Resolution 181, the partition plan for Palestine and Israel. Israel existed. Palestine diminished. Why?”Abbas said as he described the UN resolution, designated to create a Jewish and an Arab state.
Asked why the Arabs had rejected the plan while Jewish leaders accepted it, Abbas replied: “It was our mistake. It was an Arab mistake as a whole. But do they punish us for this mistake for 64 years?” Palestinian leaders have always insisted that Resolution 181, which paved the way for Jewish statehood in parts of then-British-ruled Palestine, must be resisted by Arabs who went to war over it.
Decades of regional fighting have hinged on challenges to Israel’s existence and expansion.
By describing historical fault on the Arab side, Abbas appeared to be offering Israel an olive branch, while promoting his own bid to sidestep stalled peace talks by winning UN recognition for a sovereign Palestine.
When the interviewer suggested the reason was Jewish leaders’ acceptance of the plan and its rejection by the Arabs, Abbas said: “I know, I know. It was our mistake. It was our mistake. It was an Arab mistake as a whole.”