The Lord's day is a common designation for the first day of the week (i.e., Sunday) when Christians meet to celebrate Christ's resurrection (cf. Acts 20:7). Scripture indicates that Christ arose on the first day of the week and appeared to His disciples as a group on the same day (Mark 16:1-2; John 20:19-29). Thus the Lord's day is distinct from the Sabbath or seventh day of the week (i.e., Saturday) that was given to Israel as a day of rest in celebration of God's rest from creation on the seventh day (Genesis 2:1-3; Exodus 20:8-11; 31:13-17; Nehemiah 9:14). Traditionally the church has assembled on the Lord's day for such activities as worship (particularly through the Lord's Supper), the reading and teaching of Scripture, fellowship, prayer, discipline, and giving (Acts 2:42; 20:7; 1 Corinthians 5:1-13, especially v. 4; 16:1-2; Hebrews 10:25).

This topic is from the Lockman Foundation.