Sabbath was first described in the Biblical account of the seventh day of Creation. Observation and remembrance of Sabbath is one of the Ten Commandments (the fourth in the original Jewish, the Eastern Orthodox, and most Protestant traditions, the third in Roman Catholic and Lutheran traditions); though views differ on the applicability of Biblical law in Christianity. Most people who observe Biblical Sabbath regard it as having been instituted as a "perpetual covenant [for] the people of Israel" and proselytes (Exodus 31:13-17, Exodus 23:12, Deuteronomy 5:13-14), a sign in respect for the day during which God rested after having completed Creation in six days (Genesis 2:2-3, Exodus 20:8-11). Isaiah extends the term to include even corrupted rest-day traditions (Isaiah 1:13).