Excuses of Sunday Keepers- Part 1

There is not a single line authorzing the observance of Sunday service in the Bible.
In spite of knowing this fact well, some insist that Sunday in the Biblical day of Worship.
Let's find out what their excuses is.
"After Jesus' resurrection, the Sabbath was changed to Sunday; for the resurrection occurred on Sunday and the day of Pentecost when the Holy Spirit descended was also Sunday."

This is a nonsense excuse like a man insists that because he was born on Sunday, his father's birth should be changed to Sunday.
Resurrection Day and the Sabbath are basically different in commemorative meaning; the former is the day to celebrate the resurection of Jesus, and the latter is a memorial of God's work of creation. And the apostles celebated the day of Pentecost to commemorate the descent of the Holy spirit. Today's Sunday keepers, not celebrate the Pentecost, use it as an excuse to justify their Sunday observance. How detestable!
In addition to the Sabbath, God established seven annual feasts: the Passover, the Feast of Unleavened Bread, the Resurrection Day[The Day of Firstfruits], the Day of Pentecost [the Feast of Weeks], the Feast of Trumpets, the Day of Atonement and the Feast of Tabernacles.
Every feast has its own commemorative meaning.
Jesus said that He didn't come to abolish the Law but to fulfill it, and that not the smallest letter, not the least stroke of a pen, would by any means disappear from the Law until everything was accomplished.(Mt 5:17)
So the Bible says that if anyone takes away the smallest part of the law, God will away from him has share in the kingdom of heaven.(Rev 22:19)