Israel delayed a cabinet vote on the cease-fire deal in Gaza after Prime Minister Benjamin Netanyahu accused Hamas of reneging on parts of the agreement, underscoring the pact’s fragility as mediators worked to ensure the deal’s planned implementation on Sunday.

A vocal member of Mr. Netanyahu’s governing coalition took a stand against a cease-fire deal late on Thursday. Itamar Ben-Gvir, Israel’s hard-line national security minister, threatened to resign and remove his party from the Israeli government if the cabinet voted to approve the provisional cease-fire deal.

Israeli Prime Minister Benjamin Netanyahu accused Hamas of backing out of a cease-fire deal to release hostages and end the war in Gaza, which has raged for more than a year.