Matt. 28:1; Mark 16:2,9; John 20:1,19- the Gospel writers purposely reveal Jesus' resurrection and appearances were on Sunday. This is because Sunday had now become the most important day in the life of the Church.
Acts 20:7 - this text shows the apostolic tradition of gathering together to celebrate the Eucharist on Sunday, the "first day of the week." Luke documents the principle worship was on Sunday because this was one of the departures from the Jewish form of worship.
1 Cor. 16:2 - Paul instructs the Corinthians to make contributions to the churches "on the first day of the week," which is Sunday. This is because the primary day of Christian worship is Sunday.
Col. 2:16-17 - Paul teaches that the Sabbath was only a shadow of what was fulfilled in Christ, and says "let no one pass judgment any more over a Sabbath."
2 Thess. 2:15 - we are to hold fast to apostolic tradition, whether it is oral or written. The 2,000 year-old tradition of the Church is that the apostles changed the Sabbath day of worship from Saturday to Sunday.
Heb. 4:8-9 - regarding the day of rest, if Joshua had given rest, God would not later speak of "another day," which is Sunday, the new Sabbath. Sunday is the first day of the week and the first day of the new creation brought about by our Lord's resurrection, which was on Sunday.
Heb. 7:12 - when there is a change in the priesthood, there is a change in the law as well. Because we have a new Priest and a new sacrifice, we also have a new day of worship, which is Sunday.
Rev 1:10 - John specifically points out that he witnesses the heavenly Eucharistic liturgy on Sunday, the Lord's day, the new day of rest in Christ..