The modern State of Israel recognizes two official languages: Hebrew and Arabic. Nearly all of its Jewish citizens came from somewhere else within the last 2-3 generations. When these immigrants came, they brought their language. Pressure from Israeli society eliminated the vast majority of their languages.
While 49% of Israelis over 20 claim Hebrew as their native language, according to Wikipedia, 18% claim Arabic, and 15% Russian. The other 18% speak Yiddish, French, English, Spanish, and “Other” languages, which include Romanian, German, and Amharic.
The language picture is more complex than at first glance. A language may include multiple dialects, each living its own dynamic. Some of the last speakers of certain language dialects live in Israel. Active violence has also taken place against other languages.
As Hebrew was chosen as the official language, its proponents put in place a system that does not give other languages space to live and grow.