The Seventh-day Adventists do not believe that there is any scriptural support for worship on Sunday.  Though there is no explicit NT statement authenticating Sunday worship, there are plenty of verses dealing with Sunday, the first day of the week, as being special, a day of breaking bread, and of gathering collections.

1. Jesus rose from the dead on the first day of the week (Matt. 28:1-7; Mark 16:2, 9; Luke 24:1; John 20:1).
2. Jesus appeared to the disciples on the first day of the week (John 20:19).
3. Jesus appeared inside the room to the eleven disciples eight days after the first day of the week.  The Jewish way of measuring days meant that it was again Sunday
   (John 20:26).
4. The Holy Spirit came on Pentecost, the first day of the week (Lev. 23:16; Acts 2:1).
5. The first sermon was preached by Peter on the first day of the week (Acts 2:14).
6. Three thousand converts joined the church on the first day of the week (Acts 2:41).
7. The three thousand were baptized on the first day of the week (Acts 2:41).
8. The Christians assembled broke bread on the first day of the week.
9. The Christians also heard a message from Paul on the first day of the week (Acts 20:7).  Note:  the reference is until midnight which is not the Jewish method of measuring days, but the Roman system.
10. Paul instructed the churches to put aside contributions on the first day of the week
    (1 Cor. 16:2).
11. Jesus gave the apostle John the vision of Revelation on the first day of the week
    (Rev. 1:10).¹I am indebted to Jan Karel Van Baalen in his book, The Chaos of Cults, Grand Rapids: Eerdmans, 1967, for several of the above citations.