This is the flag of Al-Sabirin a/k/a Hosn, which translated into English is said to be "The Patient for the Victory of Palestine," a newly-emerging terrorist organization, which has recently appeared in Gaza. It is said to be funded by, sponsored by, and aligned with, Iran. Note the similarity between the new group's flag, and that of Hezbollah.
Al-Sabirin is alleged to have been organized by a banished former member of Palestinian Islamic Jihad
(PIJ), who is loyal to Tehran, unlike the PIJ, which would not support the Iranian position of support with regards to the Shiite insurgents in Yemen.