Israeli Prime Minister Benjamin Netanyahu vowed Monday that Israel will keep fighting despite international criticism, and said he has no plans to resign.

Netanyahu said Israel will not agree to a cease-fire, saying doing so would mean surrendering to Hamas.

Netanyahu implored the international community to back Israel, framing the war as a fight for civilization itself.

He said Hamas will continue to use civilians as human shields as long as the international community keeps blaming Israel for their deaths.

-ABC News' Matt Rivers

The United Nations Relief and Works Agency for Palestine Refugees said 63 of its staff members have been killed and at least 22 staffers have been injured since Oct. 7.

Ten have been killed in the last 72 hours.

Pvt. Ori Megidish, a female Israeli soldier who was kidnapped by Hamas on Oct. 7, was rescued during the Israeli military's ground operations overnight, the Israel Defense Forces said Monday.

She's now home with her family, the IDF said.

Editor's Note: An earlier IDF statement said a kidnapped female Israeli soldier was released, but later clarified that she was rescued.

The death of Shani Luk, a 23-year-old German-Israeli woman who was kidnapped by Hamas on Oct. 7, was confirmed by both the Israeli Foreign Ministry and the German government on Monday.

German Chancellor Olaf Scholz wrote on social media, "The news of Shani Louk's death is terrible."

"This shows the full barbarity behind the Hamas attack - who must be held accountable." Scholz said. "This is terror, and Israel has the right to defend itself."

Doctors Without Borders called for a ceasefire Saturday saying the conflict has reached "a new low in an endless stream of unconscionable violence." The organization, which has been providing medical care to people in Gaza, also condemned world leaders for not calling for a ceasefire.

"The deadly attack outside the gate of Al-Shifa hospital impacting an ambulance is horrendous. This is a lethal attack outside Gaza's main and busiest hospital, where our staff work daily to provide lifesaving medical care. We have repeatedly called for an immediate and total ceasefire, for the protection of healthcare facilities, as well as medics, patients and people who are taking shelter there," Doctors Without Borders said in a statement Saturday.

"This is a new low in an endless stream of unconscionable violence. The repeated strikes on hospitals, ambulances, densely populated areas and refugee camps are disgraceful. How many people have to die before world leaders wake up and call for a ceasefire?" Doctors Without Borders said.

This comes as the Palestinian death toll rises to 9,488 -- including 3,900 children and 3,509 women -- and 24,158 Palestinians were injured, according to the Hamas-run Gaza Health Ministry.

One physician described seeing an ambulance hit outside Al-Shifa hospital.

"We were standing inside the hospital gate when the ambulance was directly hit in front of us. There were bloody bodies everywhere. Many were killed immediately, while we rushed others to the operating room for emergency care," Dr. Obaid, a Doctors Without Borders doctor at Al Shifa hospital, said.

The Israel Defense Forces claimed its aircraft hit an ambulance that it believes was being used by Hamas and called for civilians to move south for safety.

-ABC News' Cindy Smith and Emma Ogao