There is no biblical command, example or even inference that the Sabbath day has been abolished or changed to the first day of the week. Following Yahushua's death, the Sabbath was observed by His followers. The first day of the week (beginning Saturday at sunset) they came to the tomb to anoint His body. But they found His tomb empty. At His first appearance since His resurrection, Yahushua found His disciples behind locked doors because they were afraid of the Jews. This was not to celebrate the resurrection. They did not believe that He had risen! It was the earliest opportunity He had to go and prove to the disciples that He was not dead, but living.
No scripture concerning the first day of the week gives authority to replace Sabbath worship with Sunday observance. Whether these eight New Testament passages even refer to Sunday is not entirely clear. In each of the verses, the word day appears in Italics or parentheses in the King James and New King James. That means that the word day did not exist in the original manuscripts. It was assumed by translators who brought the Greek into English.
To say that the Sabbath has been changed to the first day of the week is to say that the Ten commandments are no longer necessary to keep. For one of the commandments is:
It is the day that He sanctified at Creation:
Exod 20:9 (NKJV) Six days you shall labor and do all your work, but the seventh day [is] the Sabbath of Yahweh your Elohim.
The Ten commandments were written in stone by Yahweh's own finger.
Gene 2:2 (NKJV) And on the seventh day Elohim ended His work which He had done, and He rested on the seventh day from all His work which He had done. 3 Then Elohim blessed the seventh day and sanctified it, because in it He rested from all His work which Elohim had created and made
Do you suppose that the 4th commandment is cut out of the Ten Commandments in this ark? Or do you suppose that the 4th commandment has the entire section about Him resting on the 7th day scratched out? All of the Ten Commandments were written in stone to signify that it is forever. We must beware of spiritualizing away something that has its original kept safe in heaven. And I for one can tell you, keeping the true Sabbath the way that we should be keeping it reaps eternal blessings!
Reve 11:19 (NKJV) Then the temple of Yahweh was opened in heaven, and the ark of His covenant was seen in His temple. And there were lightnings, noises, thunderings, an earthquake, and great hail.