- Temple Isaiah is more than a synagogue â€“ itâ€™s a Jewish Neighborhood! Here you will find learning and purpose, friendship and celebration. As the oldest and largest synagogue in Contra Costa County, our roots lie deep in a uniquely Californian, vibrant approach to Jewish tradition and innovation. We embrace all who come through our doors with warmth and caring, with an openness to diversity and a commitment to the dignity of each person in our midst. We use our hearts, minds and hands to fulfill in modern times the ancient prophetic call to social justice. Temple Isaiah is a Jewish Neighborhood of spirituality and study, a place filled with Godâ€™s spirit and human kindness. We know there is a place for you in our communityâ€”join us!