Abington School District v. Schempp
Abington School District v. Schempp, 374 U.S. 203 (1963), was a landmark United States Supreme Court case in which the Court decided 8–1 in favor of the respondent, Edward Schempp, on behalf of his son Ellery Schempp, and declared that school-sponsored Bible reading and the recitation of the Lord's Prayer in public schools in the United States was unconstitutional.
Source: Wikipedia — Abington School District v. Schempp (CC BY-SA 4.0)