original_query: What was the Rubinstein proposal and why was it not taken up?
query: What was the Rubinstein proposal regarding JNF land and why was it not adopted?
answer: Amnon Rubinstein proposed distinguishing between JNF lands acquired through foreign donations (for Jews only) and those purchased from the state (formerly Palestinian lands). The former would remain under JNF control, while the latter would revert to state control.  The proposal aimed to avoid discriminatory legislation but was not adopted.