Judaism is the ancient tradition of a relatively small community of people originally called Hebrews, or Israelites. Judaism was the first religion to hold as its central dogma the idea of monotheism: the belief that there is only one God, an infinite, omniscient source of all power and righteousness who has shared a special relationship with God's "chosen people" since the days of the biblical forbearers Abraham and Sarah. Judaism as a religion has developed over thousands of years, but has always emphasized the oneness of God, the observance of commandments, the study of Torah and the importance of community and family. The word "Jew" itself is taken from the name Judah, who was one of the biblical Jacob's twelve sons (and a great-grandson of Abraham). Judaism has become the manifestation of a multi-ethnic, religious and social community, with an emphasis on action supported by beliefs.