[okokhacker]

I don’t think anyone uses a saying to back claims over land.

In any case, your comment seems to suggest that Palestinians /could not/ have come up with this phrase, and had to resort to stealing the occupier’s, which is wildly misleading.

In any case, the origin of the phrase is ascertain.

[FireBeyond]

This is pretty apologist. The PLO started using it while referring to Likud, so it was their version of taking it back, in the 1980s.

I'm sure they could have come up with it themselves had they wished.

But whitewashing it as just a saying on Israel's part, but a threat on Palestine's... given that multiple members of Likud, often in official capacities, openly espouse and encourage exactly that, taking more land from Palestine.