Agreed, since the number 8 would generally only appear as a 'monthly' calculation, as in the 8th day of the month, which could be on any day of the numbered week {1-7}, or with circumcision, being counted from the birth of the child, again landing on any day of the week, but a singular {usually} event.
According to scripture there is no such thing as the 8th day of the week, see Gn 2:1-3; Ex 20; Dt 5, and so on. The ogdoad is a gnostic concept, historically demonstrable.
There are passages which speak of an eighth day, but this is not the eighth day of the week, but is generally associated with 1 time event of physical circumcision {Lev 12:3}, which was to happen 8 days after the birth of the male child, and could even be done upon Sabbath {Jhn 7:22}, or some other event, like the bringing of a sacrifice, having nothing to do with a weekly cyclic timetable, but rather timetable based upon a beginning event other than the week {Lev 14}, and thus could land upon any day of the numbered week {1-7}, or a counting from a seasonal sabbath, such as the 8th day from the first seasonal sabbath of booths {Lev 23:36,39; see also Num 29}, which itself was based upon the counting from the phase of the moon, not the numbered days of the week {1-7}.
In the New Testament we see Jesus appearing and meeting with the disciples on several days of the week, for instance:
Jesus met with the disciples at the Mt of Olives before His ascension, which was 10 days before Pentecost {50 days}. No matter how one figures Pentecost, go back ten days {to the fortieth day {40}}, and it is not the same day of the week. So if they are one to figure Pentecost as being upon the first day of the week, ten days prior is not the first day of the week, and if they figure Pentecost was not on the first day of the week, the point is again sustained. Additionally we read that Jesus was seen of them for 40 days, not merely on the first day of the week.
To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God: Acts 1:3
And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me. Acts 1:4
Furthermore, we read after Jesus visited with the Disciples on the Road to Emaus, it was coming into the latter evening/night on the first day of the week, and after they found out it was Jesus at the evening meal, those two disciples ran back up to Jerusalem in the dark, which would be the following day according to Biblical time, and Jesus appeared to them, thus on the Second Day of the week:
But we trusted that it had been he which should have redeemed Israel: and beside all this, to day is the third day since these things were done. Luke 24:21
But they constrained him, saying, Abide with us: for it is toward evening, and the day is far spent. And he went in to tarry with them. Luke 24:29
And they rose up the same hour, and returned to Jerusalem, and found the eleven gathered together, and them that were with them, Luke 24:33
And as they thus spake, Jesus himself stood in the midst of them, and saith unto them, Peace be unto you. Luke 24:36
Thus it was that we see that even during the first Evening of the Second Day of the Week, Jesus was with them.
The disciples held no great significance to the first day of the week, as some mystical '8th day', or placed it upon any weekly significance, as they met daily in the Temple, praising God {Luk 24:53; Acts 2:46, 5:42, see also Acts 3:2}, even as Jesus met in the temple Daily also before them, even in the last week of his -
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The Sabbath of the Lord {Matt 12:8; Mar 2:28; Luk 6:5; Rev 1:10}, the 7th Day however, was always important to them {Acts 4:24, 13:14-16,42-44, 14:15, 15:21, 16:13, 17:2, 18:4; Heb 4:1-11, Rev 1:10, 10:6, 14:7; &c}, as it always reminded them, as it does to us, of Jesus, their Lord, God and Creator, and the price He paid for our sin{s} {Luk 23:54-56}, which is transgression of the Law of God {1 Jhn 3:4}.
In fact, every single first day of the week text in Scripture proves the 7th Day Sabbath as the culmination of God's created order, just look at the Greek.
