The Israeli army says it will hold a daily "tactical pause in military activity" along a road in southern Gaza to allow more humanitarian aid to enter, but stressed there is no ceasefire and fighting will continue in Rafah.
The breaks, which reportedly began on Saturday, will last from 08:00 local time (05:00 GMT) to 19:00 local time until further notice.
Aid agency ActionAid told the BBC it was getting a "confusing" idea of what the pauses meant.
Israel has been under constant pressure from its allies, including the US, to prevent the humanitarian crisis in Gaza from worsening.
The humanitarian pause route leads from the Kerem Shalom crossing in southern Gaza to Salah al-Din Road - a major highway - and then north to the European Hospital near the town of Khan Younis.
In a post on X, the IDF clarified that there is no ceasefire in the southern Gaza Strip and fighting will continue in Rafah.
According to Israeli media, neither Israeli Prime Minister Benjamin Netanyahu nor Defense Minister Yoav Gallant were aware of plans for a pause before it was announced.
Netanyahu's office reportedly said the prime minister told his military secretary the plan was "unacceptable" after hearing about it on Sunday.
Israel's far-right National Security Minister Itamar Ben Gvir said the decision to cease fighting was made by a "fool" who was "evil".
Hundreds of thousands of people have fled Rafah since Israeli troops entered it more than a month ago, taking control of the Gaza side of the Rafah crossing with Egypt and ordering many to evacuate.
Israel says its operation in Rafah is necessary to drive Hamas from what it calls the group's "last major stronghold."
International agencies have warned of a dire humanitarian situation in Gaza and have made repeated calls to allow more aid.
The number of aid trucks entering Gaza continues to be far below what agencies have said is required.
The UN humanitarian office, known as OCHA, reported that in May, the average daily number of trucks delivering humanitarian aid to Gaza - not including fuel - was 97. In April the figure was 169 and in March it was 139.
OCHA states that since May 7, it has not been able to directly observe the arrival of aid from the private sector through the Kerem Shalom crossing.
The IDF said eight Israeli soldiers were killed in an explosion in Rafah on Saturday - the deadliest incident in the war for the army since January.
Hamas' armed wing said it fired a rocket at an armored vehicle after setting up an ambush.
Netanyahu has vowed to continue the fight against Hamas, urging Israelis not to allow anyone to "distract" them from "the plain and simple fact - despite the heavy and shocking cost, we must adhere to the goals of the war".