Below is the Israeli law concerning elections.

Tomorrow, President Rivlin will inform the Speaker of the Knesset that, for the first time in Israel’s history, no candidate was able to form a government.

Tomorrow at 13:15, President Reuven (Ruvi) Rivlin will hand an official announcement to the Speaker of the Knesset regarding the expiration of the mandate, and the two will then give statements to the press. An announcement regarding press arrangements at Beit HaNasi for tomorrow will be issued in the morning.

According to the text of the announcement that the president will hand to the speaker, the 28 day period that was given to MK Benny Gantz to form a government have passed and he was unable to do so, and therefore according to paragraph 10 of Basic Law: The Government (2001), from Thursday 21 November 2019 / 23 Cheshvan 5780, a majority of members of Knesset [at least 61 MKs] are able to ask the president, in writing, to give the task of forming a government to a member of Knesset (including a  member of Knesset who has already been given the task in previous rounds) who has agreed in writing to do so, all within 21 days.

For your convenience, below is background material regarding the constitutional procedure that is expected in the coming 21 days, whose aim is to give a final opportunity to members of Knesset to form a government before the Knesset is dispersed ahead of new elections:

1.    Basic Law: The Government 10 (a) states that where a government has not been formed in previous procedures under the law, a majority [at least 61] of the members of the Knesset may request, in writing, that the President of the State assign the task to a particular member of the Knesset, [including a member of Knesset who has already been given the task in previous rounds] who so agreed in writing.
2.    The period of 21 days that starts on Thursday 21 November 2019 / 23 Cheshvan 5780, and which follows the 28-day period given to Benny Gantz MK, will expire at 24:00 on Wednesday 11 December 2019 / 13 Kislev 5780.
3.    Once the President of the State has been presented with a request of this kind, he must give the task of forming a government to the member of Knesset nominated in the request within two days.
4.    The member of Knesset entrusted with forming the government under this procedure has a period of 14 days to do so.
5.    If no request is presented by a majority of members of the Knesset within 21 days, the President of the State must inform the Speaker of the Knesset that no such request has been presented and the Knesset will be dissolved and new elections held.
6.    Members of Knesset have 21 days to present a request to the President of the State and according to Basic Law: The Government 10 (a) there is no requirement to wait until the end of this period to present a request to the President of the State, and they can do so at any point during this period.
7.    Within two days of a request being presented to the President of the State, whether it is close to the end of the 21-day period or beforehand, the President must give the task of forming a government to the member of Knesset nominated in the request.
8.    The request must be presented to the President of the State, at Beit HaNasi in writing and in person. The request must include the original signatures of at least 61 members of Knesset and the written agreement of the nominated candidate who the President of the State is requested to ask to form a government.
9.    Once the President of the State has informed the Speaker of the Knesset that no such request has been presented, according to Basic Law: The Government 11 (b), the Knesset shall be deemed to have decided to disperse prior to the completion of its period of service, and elections for the Knesset will be held on the last Tuesday before the end of 90 days of the President's announcement.