The Sabbath was Friday-Saturday, not Sunday. Sunday was the kuriaké hémera "Lord's Day" (cf. Didache 14:1, Revelation 1:10, Gospel of Peter 12:1), e.g. the day Jesus rose from the dead, on which Christians assembled for the eucharist. See the epistle of Barnabas 15:8-9 for a likening of Sunday to the "eighth day" of creation week (which is created to replace the sabbath which is no longer "acceptable"), which the author explains "is why we spend the eighth day in celebration, the day on which Jesus both arose from the dead and, after appearing again, ascended into heaven".
I disagree with this. The Messiah said that he was Lord of the Sabbath day in Mark 2:28. He said the Sabbath was made for MAN, (not Israel) and that we are to keep it holy and DO GOOD on it. Where did Sunday come into play? It seems that the later Church fathers made it up, all part of their Babylonian Trinity and other false dogma. The law was transferred (Hebrews 7:12) to Messiah along with the priesthood. Hebrews 4 teaches us that God rested on the Sabbath day, (7th day) and we are to imitate God, the author said (whoever wrote Hebrews, we don't know, it was definitely NOT PAUL). The epistle of Barnabas is not scripture. That writing was assembled in the latter part of the 7th century of our era.
The "Lord's Day" is a future reference to things about to occur according to revelation. It is not a reference to Sunday, which is not the lord's day. The Shabbat is the Lord's day of rest. He also was not resurrected on a Sunday. That makes no sense at all in accord with Jonah's "3 days and 3 nights". 3 days and 3 nights from Friday was Monday at the earliest, but since Messiah was hung on a High Sabbath, (the day of preparation being before which would be Wednesday) then he rose late on the Sabbath day just as Matthew 28:1 says....
Sorry... You are wrong on this Leolaia. Too much pagan Greek Church stuff and Ex-Watchtower stuff lingering around I think. Try Messianic Judaism out for a change. The real Messiah by the way is Yoseph's son. Not a spirit baby according to some pagan neo-platonism. Isaiah 7:14 doesn't belong in Matthew. The real true Hebrew Matthew doesn't have that verse. Isaiah 7:14 is fulfilled in Isaiah 8:3 anyway.... A sign to Ahaz makes no sense 400+ years before the Messiah is born... It's biblical ballyhoo.