Over 3,000 police will be deployed across Israel, with a focus on Jerusalem, in preparation for and during the Passover holiday, which begins on 19 April at sundown. A spokesman said that tens of thousands of people are expected to arrive in Jerusalem for the first day of the holiday, and another 100,000+ on the second day for the High Priest prayer service at the western wall. This mass priestly blessing only takes place twice a year, once during Sukkot and again on Passover. Attendees receive the historic blessing from hundreds of Jews of priestly lineage as they face the congregation, hands stretched forward, chanting in one voice. The increase in security, involving border police, undercover officers, and members of special patrol units, is necessary due to a history of increased risk during the holiday period.