There is no record of "weekly" first day observances in the Biblical Scriptures
Acts 20:7
And upon the first day of the week, when the disciples came together to break bread...
1 Corinthians 16:2
Upon the first day of the week let every one of you lay by him in store, as God hath prospered him...
And upon the first day of the week, when the disciples came together to break bread...
1 Corinthians 16:2
Upon the first day of the week let every one of you lay by him in store, as God hath prospered him...
And pagans met on the first day of the week (Sunday) in honor of their SUNgod long before the supposedly newly converted Roman and Greek early fathers of the RCC began meeting on Sunday.
The scriptures liken Christ to the Sun, and liken the resurrection of Christ to the rise of the Sun on Sunday, all of which is no coincidence. Notice the connection between Sunrise and Sonrise in these verses:
Mark 16:2, 16:6
Very early in the morning, on the first day of the week, they came to the tomb when the sun had risen...But he said to them, “...He is risen!
Very early in the morning, on the first day of the week, they came to the tomb when the sun had risen...But he said to them, “...He is risen!
When the Sun rose, the Son also rose! That was not a coincidence. He also made his very first appearance to the disciples after his resurrection on a Sunday (John 20:19).
By the way, it is no coincidence that the words SUN and SON are homophones! The Son's rise was prophesied by Malachi by likening His resurrection to the rise of the Sun:
Malachi 4:2
But to you who fear My name the Sun of Righteousness shall arise with healing in His wings;
But to you who fear My name the Sun of Righteousness shall arise with healing in His wings;
Notice that Malachi likens Jesus Christ, the Son of God, with the Sun, and compares His resurrection with the rise of the Sun. As the Sun rises (in a manner of speaking), the Son also rises!
Jesus, the Son, is likened to the Sun in Luke 1:67, 78-79 NIV:
His father Zechariah was filled with the Holy Spirit and prophesied: "...because of the tender mercy of our God, by which the rising sun will come to us from heaven to shine on those living in darkness and in the shadow of death, to guide our feet into the path of peace.
Other scripture passages do the same, such as 2 Peter 1:19.
The Sun is the bridegroom in Psalm 19:1, 4-5:
The heavens declare the glory of God...In them hath he set a tabernacle for the sun, which is as a bridegroom coming out of his chamber...
The Son is the bridegroom in John 3:29:
He that hath the bride is the bridegroom: but the friend of the bridegroom, which standeth and heareth him, rejoiceth greatly because of the bridegroom's voice: this my joy therefore is fulfilled.
In the gospel of John, Jesus was referring to the sun when he referred to "the light of this world":
Jesus answered, Are there not twelve hours in the day? If any man walk in the day, he stumbleth not, because he seeth the light of this world. (John 11:9)
And in the same gospel, Jesus also referred to himself as "the light of the world":
Then spake Jesus again unto them, saying, I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life. (John 8:12)
So we see that scripture likens the Son with the sun, and that is why Christians observe Sunday--because it is the day of the Son and the day of the Sun.
So it is entirely appropriate that under the New Covenant Christians observe Sunday as our day of observance because it is both the day of the Sun and the day of the Son.
The early Christian leader Justin Martyr wrote the following in chapter 67 of his First Apology:
And on the day called Sunday, all who live in cities or in the country gather together to one place, and the memoirs of the apostles or the writings of the prophets are read, as long as time permits; then, when the reader has ceased, the president verbally instructs, and exhorts to the imitation of these good things. Then we all rise together and pray, and, as we before said, when our prayer is ended, bread and wine and water are brought, and the president in like manner offers prayers and thanksgivings, according to his ability, and the people assent, saying Amen; and there is a distribution to each, and a participation of that over which thanks have been given, and to those who are absent a portion is sent by the deacons. And they who are well to do, and willing, give what each thinks fit (2 Corinthians 9:7); and what is collected is deposited with the president (1 Corinthians 16:2), who succours the orphans and widows and those who, through sickness or any other cause, are in want, and those who are in bonds and the strangers sojourning among us, and in a word takes care of all who are in need. But Sunday is the day on which we all hold our common assembly, because it is the first day on which God, having wrought a change in the darkness and matter (Genesis 1:3-5), made the world; and Jesus Christ our Saviour on the same day rose from the dead (Mark 16:2, 16:9). For He was crucified on the day before that of Saturn (Saturday); and on the day after that of Saturn, which is the day of the Sun, having appeared to His apostles and disciples, He taught them these things, which we have submitted to you also for your consideration.
Source: http://www.ccel.org/ccel/schaff/anf01.viii.ii.lxvii.html