Historical writings show that Christians met regularly on Sunday, the first day of the week, because it had been the day upon which Jesus had risen.
One in particular caught my attention recently —
107 AD “Be not deceived with strange doctrines, nor with old fables, which are unprofitable. For if we still live according to the Jewish law, we acknowledge that we have not received grace… If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death (which some deny), through which mystery we received faith, and on account of which we suffer in order that we may be found disciples of Jesus Christ our only teacher, how shall we be able to live apart from him for whom even the prophets were looking as their teacher since they were his disciples in the spirit?… let every friend of Christ keep the Lord’s Day as a festival, the resurrection-day, the queen and chief of all the days of the week” (Ignatius, Epistle to the Magnesians, chp 9. Ante-Nicene Fathers 1:62-63).
Those who choose to keep the law are not partakers of the grace and truth brought by Jesus Christ. They have no hope in the seventh day.
For our hope is that we too will raise from the dead and experience the power of the resurrection having our mortal bodies transformed into ones that are incorruptible.
Resurrection and ascension ratified the efficacy of God’s covenant of salvation and displayed God’s immense sovereignty and ensures the hope of believers.
“See, we are going up to Jerusalem, and the Son of Man will be handed over to the chief priests and scribes, and they will condemn him to death; then they will hand him over to the Gentiles to be mocked and flogged and crucified; and on the third day he will be raised.” – Matthew 20:18-19