Prime Minister Benjamin Netanyahu has made his first public statement regarding the death of eight Israeli soldiers in southern Gaza, mourning their deaths.

"Citizens of Israel, today we paid a heart-rending price in our just war in defense of our homeland. With deep sorrow, and in heavy mourning, I bow my head together with all citizens of Israel and weep over the fall of our heroic fighters: Deputy company commander in an engineering battalion, Capt. Wassem Mahmoud and additional heroic soldiers whose names have yet to be released," Netanyahu said in a statement Saturday.

Netanyahu said Iran's "axis of evil" will continue trying to "destroy us if we do not stop it."

"Despite the heavy and unsettling price, we must cling to the goals of the war: The destruction of Hamas's military and governing capabilities, the return of all of our hostages, making certain that Gaza will never again constitute a threat to Israel and the return of our residents securely to their homes in both the north and the south," Netanyahu said.

"We are in the midst of a very difficult war. The war is being conducted on several fronts, including the international front. We are ready for many additional challenges. It is at this time that we must show our people's strength of spirit, thanks to which we have overcome all of our enemies," Netanyahu said.

After repeated warnings from the World Food Programme, UNICEF and the World Health Organization about an imminent famine in Gaza, over 50,000 children in Gaza now require treatment for malnutrition, the United Nations Relief and Works Agency for Palestine Refugees in the Near East released said in a statement Saturday.

"With continued restrictions to humanitarian access, people in #Gaza continue to face desperate levels of hunger. Over 50,000 children require treatment for acute malnutrition UNRWA teams work tirelessly to reach families with aid but the situation is catastrophic," the UNRWA said in a statement on X.

Eight Israeli Defense Forces soldiers were killed in an "incident" in southern Gaza, according to the IDF.

Earlier Saturday, Hamas released a statement saying an operation targeting Israeli military vehicles in Rafah killed several IDF soldiers. The IDF has not commented on the nature of the soldiers' deaths.

-ABC News' Nasser Atta and Yael Benaya

Andrey Kozlov, one of the four Israeli hostages rescued from Gaza on Saturday, is urging Israelis to gather Saturday at "Hostage Square" in Tel Aviv in support of the hostages and their families.

"I'm already in Israel at home. But a lot of hostages are still there in Gaza," Kozlov, 27, said in a video message. "I saw a lot of rallies on Saturday, and it gave me a lot of hope."

Kozlov’s girlfriend told ABC News this week that Kozlov was psychologically tortured while in captivity, and she said that he told her the moment he realized the Israeli soldiers were there to save him, he felt he was reborn.

The four hostages rescued from Gaza this weekend are physically "in less severe condition than we kind of prepared for," said Itai Pessach, head of the medical team at the Sheba Medical Center, where the hostages are being treated.

But the worry is mainly on the long-term psychological impact, as "they underwent continuous, psychological abuse," Pessach told ABC News.

The rescued hostages -- Noa Argamani, 25; Almog Meir Jan, 21; Andrey Kozlov, 27; and Shlomi Ziv, 40 -- were kidnapped by Hamas from the Nova music festival on Oct. 7, according to the Israel Defense Forces. They were all rescued in good condition, the IDF said.

Argamani has been discharged while the three men remain at the hospital. But Argamani will still be receiving medical treatment from the Sheba team for an indefinite period, Pessach said.

"It's a very, very long process of rehabilitation. And we received captives that came back six months ago, and we're just now starting to see the initial post-traumatic response coming up," Pessach said. "They have seen a lot of war-related things that happened and all of that is part of their trauma, and we will need to care for that."

"When you see the eyes and you see, you know, they get silent for a second and you understand that there's a trigger, there's something in their minds, and you see a tear, or they ask to be left alone for a moment or something like that. This is when you really feel, under the surface there’s so much that's waiting for us," Pessach said.

-ABC News' Tom Soufi Burridge, Dana Savir, Omer Manor and Hugo Leenhardt