In the Judeo-Christian Scriptures, in Genesis, the seven-day week is defined after the description of God's efforts in establishing the world, and universe with the seventh day being the Sabbath, commemorating God's day of rest. In Apostolic times the practice is noted in Acts of meeting together on the first day of the week for Eucharistic Sacrifice which is called the Lord's Day in remembrance of our Lord's Resurrection. By the second century the Lord's Day was looked upon as the day of rest and the day for celebrating the Divine Liturgy, replacing the Jewish Sabbath. Then in 325, the Council of Nicea formally declared that the Lord's Day, Sunday, was the day of worship for Orthodox Christians.