1. On the first day Jesus rose from the dead (Mk. 16:9).

2. On the first day Jesus first appeared to his disciples (Mk. 16:9).

3. On the first day Jesus met with the disciples at different places and repeatedly (Mk. 16:9-11; Mt.     28:8-10; Lk. 24:34; Mk. 16:12-13; Jn. 20:19-23).

4. On the first day Jesus blessed the disciples (Jn. 20:19).

5. On the first day Jesus imparted to the disciples the gift of the Holy Spirit (Jn. 20:22).

6. On the first day Jesus commissioned the disciples to preach the gospel to all the world  (Jn. 20:21; with Mk. 16:9-15).

7. On the first day Jesus ascended to Heaven, was seated at the right hand of the Father and was made Head of all (Jn. 20:17; Ep. 1:20).

8. On the first day many of the dead saints arose from the grave (Mt. 27:52-53).

9. The first day became the day of joy and rejoicing to the disciples (Jn. 20:20; Lk. 24:41).

10. On the first day the gospel of the risen Christ was first preached (Lk. 24:34).

11. On the first day Jesus explained the Scriptures to the disciples (Lk. 24:27,45).

12. On the first day the purchase of our redemption was completed (Ro. 4:25).

13. On the first day the Holy Spirit descended (Ac. 2:1). Pentecost was on the 50th day after the sabbath following the wave offering (Le. 23:15,16). Thus Pentecost was always on a Sunday.

14. The Christians met to worship on the first day (Ac. 20:6,7; 1 Co. 16:2). Sunday is "the Lord's Day" (Re. 1:10) (D.M. Canright, Seventh-day Adventism Renounced).

Since those days, the vast majority of Christians have always met to worship on the Lord's day. They do this in honor of the resurrection of their Savior. Christ was in the tomb during the sabbath, and rose as the firstborn from the dead on the first day. The sabbath signifies the last day of the old creation (Ge. 2:2). Sunday is the first day of the new creation.