Many Christians believe the saints must be gathered together on Sunday and denominations such as the 7th Day Adventist believe that if you worship on Sunday you are worshiping on the same day as the sun god – Helios and that you should only worship on Saturday. The Sabbath indeed does fall on a Saturday, but by that logic some denominations that I could say those who worship Saturday are worshiping the god Saturn. However, these are just names of the days of the week and the days of the week belong to the Lord and nay god or goddess. The pagan names of the week do not define you as a Christian. Sunday may have been named after the sun god Helios, but before the days of the week were given heathen names there were just numbered one through seven. Both views of the demand of worship on either day are in error from a biblical standpoint.
(On a side note: I will say that we are no longer on the law in the keeping of the Sabbath days. According to Colossians 2:16 we see Christians were being judged in regards to keeping the Sabbath and a Holy Day. Jesus is Lord of the Sabbath (Luke 6:5) and He’s our Sabbath (Psalm 37:7 and Hebrews 4: 10) , but more on this in another study since the Sabbath is discussion is another tangent and not for this particular study.)
Now then, if we look at 1 Corinthians 16: 2 we see Paul given instruction to the church of Corinth about for them to “…lay by in store…” on the first day of the week. This is not a command for the church today to gather every Sunday as this was instruction to the church then so that when Paul came to visit things would be ready for as the food or whatever was given was together so that he did not have to gather it when he came.
In Acts 2:7 we see the disciples came together upon the first day of the week. This again is not a command statement or a teaching, but more of an entry of what happened upon that first of the week. No place within the scripture here do we see that it was continually every Sunday.
John 20:19 – “Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace be unto you.”
No worship was sated here as the disciples were gathered together after Jesus’ resurrection, but were hiding from the Jews. (“Being” in the Greek mean “which is” for a clearer understanding of the first part of that verse.)
Even when the disciples took communion with Jesus it was on the Passover not Sunday the first day of the week (see Luke 20). When the church would come together for communion no day of the week was mentioned (see 1 Corinthians 11: 17 – 34).
The disciples are commanded though to exhort one another daily (see Hebrews 3:13) as should we for we are Disciples of Christ.
In Acts 2: 46 the disciples continued daily with one accord in the temple. The Lord according to Acts 2:47 added to the church daily.
In Acts 5:42 daily the disciples preached and teached in every house.
Now remember, these are accounts of what they did daily. Sure we can gather daily as the disciples did then, but there is no command for that either although it would be greatly beneficial be gathered together spiritually like that.
The point: A church body can gather worship and come together to edify one another on a Sunday at 5:00 pm, Saturday at 9:00 pm, or on Tuesday at 4:00 am for a main worship service long as there is concise agreement for the days and times to be gathered so everyone will know when for God is not the author of confusion (1 Corinthians 14: 33).
Saying worship service must be on specific day is a tradition of men. In a reading Colossians 2 specifically verses: 8, 16, 20 – 23; these verses appertain to the traditions concerning the Old Testament law, but one may see where doctrines of men can be applied in various other aspects outside the Law of Moses as Sunday or Saturday worship service has been a self-imposed tradition of men under the New Covenant as we are not under the Old Covenant nor we the business as Christians making new rules to tack on to the requirement of that person must worship on Sunday either.
The thing that matters most is the quality of the worship towards the Lord and whether it in spirit and in Truth and now is that our hour because worship is a way life and not a set time. The gathering of the saints is for exhortation of the body so that we fall not away and for the edification of the body of Christ (Hebrews 10: 25, Ephesians 4: 11 – 16, and John 4: 20 – 24). Be blessed in Jesus Name!