The incident raised new doubts about the future of the fragile ceasefire deal, which has paused over 15 months of war.
The six to be released on Saturday are the last living hostages to be freed under the first phase of the ceasefire in Gaza.
The sides have carried out five swaps since the ceasefire went into effect last month, freeing 21 hostages and over 730 prisoners.
Hamas released seven of the hostages in front of the destroyed home of its slain leader, Yahya Sinwar, as thousands pressed in.
Israeli forces in Gaza killed Hamas’ top leader Yahya Sinwar, a chief architect of last year's attack on Israel that sparked the war.
The Israeli military says it has recovered the bodies of six hostages taken in Hamas’ Oct. 7 attack that started the war in Gaza.
The Palestinian militant group Hamas says it has chosen Yahya Sinwar, its top official in Gaza who masterminded the Oct. 7 attacks in Israel, as its new leader.
The bodies of Hanan Yablonka, Michel Nisenbaum, and Orion Hernandez Radoux were found and their families have been notified.