AMMAN, Jordan—U.S. Secretary of State Antony Blinken used his meetings with Middle East leaders to make a fresh push for a humanitarian pause in the Israel-Hamas war as the Israeli military said it would reopen a temporary corridor Sunday to provide northern Gazans safe passage to the south.

The Israel Defense Forces said it allowed traffic on Salah al-Din Road, a major north-south thoroughfare in the strip, for three hours on Saturday, and promised to do so again for four hours on Sunday, although residents said the route was unsafe.