Nablus flag arriving for the Nabi Musa festival, 1936. Nabi Musa is the name of a site in the Judean desert that popular Palestinian folklore associates with Moses. It is also the name of a seven-day long religious festival that was celebrated annually by Palestinian Muslims. It was considered 'the most important Muslim pilgrimage in Palestine,' and centered around a collective pilgrimage from Jerusalem to what was understood to be the Tomb of Moses, near Jericho.