The first day of the week is the Lord's Day. It is a Christian institution for regular observance. It commemorates the resurrection of Christ from the dead and should be employed in exercises of worship and spiritual devotion, both public and private, and by refraining from worldly amusements, and resting from secular employments, work of necessity and mercy only being excepted.

Exodus 20:8-11

Matthew 12:1-12; 28:1

Mark 2:27-28; 16:1-7
Luke 24:1-3, 33-36

John 4:21-24; 20:1, 19-28
Acts 20:7

1 Corinthians 16:1-2

Colossians 2:16; 3:16

Revelation 1:10