(JNS) Israel’s Ministry of Communications Director-General Shlomo Filber, a longtime associate of Prime Minister Benjamin Netanyahu, signed a deal this week to become a state’s witness in a growing corruption investigation involving the Israeli premier.

Filber is expected to testify in what is being dubbed “Case 4000,” in which Netanyahu told him to provide regulatory benefits to the Bezeq telephone company in exchange for positive coverage of Netanyahu and his family from the Walla news site. Walla and Bezeq are both owned by Shaul Elovitch, who was also arrested in connection to the case.

In the deal Filber signed, he will give testimony against Netanyahu in exchange for a guarantee not to serve prison time.