He said: "If Hamas does not return our hostages by Saturday noon, the ceasefire will end, and the IDF (Israeli military) will resume intense fighting until Hamas is decisively defeated.".
Israeli PM Benjamin Netanyahu has threatened the deal could end and fighting could erupt at midday on Saturday if Hamas does not return hostages.
So far, Israel and Hamas have completed five exchanges in the first phase of the ceasefire, freeing 21 hostages and more than 730 prisoners.
Hamas' claim Israel has been dragging its feet on allowing aid into Gaza - a charge Israel has rejected as untrue.
Hamas' terror pals Ansar Allah, known as the Houthis, has threatened to renew attacks on Israel if the deal falls apart and says "our fingers are on the trigger".
