The Sabbath Day was part of the covenant God made with Israel at Sinai (Exodus 31:13-18). The seventh day had not been a day or worship previous to this covenant (Deut. 5:1-3; Nehemiah 9:13-14). This covenant ended when Jesus died on the cross (Colossians 2:14-17). It is part of a covenant that is now obsolete and has been removed by God (Hebrews 8:13-9:4). To ignore these facts and insist on religiously observing this day, is to cut oneself off the grace of God (Galatians 5:1-4). In contrast, the day of worship (not a mandatory day of rest), under the New Covenant is the first day of the week (Acts 20:7; 1 Corinthians 16:1).