"Ingathering of the exiles" refers to the vision of the biblical prophets, who said the Jews would return to the Promised Land of Israel after a long exile among the nations.

VOA: standard.2009.08.05

Surrounded by the plunging clifftop views, it is not difficult to imagine biblical kings and prophets panting their way up the slopes -- although it is more likely you will meet a battered truck laden with tomatoes grumbling up the steep inclines.

BBC: Travelling the slow route to Petra