Analysis of information sources in references of the Wikipedia article "Eritrean Orthodox Tewahedo Church" in English language version.
Assemble yourselves together in the church, evening and morning; offer up praises, and sing; and read the Psalms of David, the sixty-second, and moreover the hundred and fortieth. And especially on the Jewish Sabbath, and on the first day of the week, the Christian Sabbath, which is the day of His holy resurrection, offer up praises and thanksgivings and glory to the Lord, who hath created all things by his Son Jesus Christ, whom he sent unto us, who was pleased to suffer according to his will, and was buried in the tomb, and rose again from the dead.
XXXIII. I Peter and Paul do make the following constitutions. Let the slaves work five days; but on the Sabbath day and the Lord's day let them have leisure to go to church for instruction in piety. We have said that the Sabbath is on account of the creation, and the Lord's day of the resurrection. Let slaves rest from their work all the great week, and that which follows it — for the one in memory of the passion, and the other of the resurrection; and there is need they should be instructed who it is that suffered and rose again, and who it is permitted Him to suffer, and raised Him again. Let them have rest from their work on the Ascension, because it was the conclusion of the dispensation by Christ. Let them rest at Pentecost, because of the coming of the Holy Spirit, which was given to those that believed in Christ. Let them rest on the festival of His birth, because on it the unexpected favour was granted to men, that Jesus Christ, the Logos of God, should be born of the Virgin Mary, for the salvation of the world. Let them rest on the festival of Epiphany, because on it a manifestation took place of the divinity of Christ, for the Father bore testimony to Him at the baptism; and the Paraclete, in the form of a dove, pointed out to the bystanders Him to whom testimony was borne. Let them rest on the days of the apostles: for they were appointed your teachers to bring you to Christ, and made you worthy of the Spirit. Let them rest on the day of the first martyr Stephen, and of the other holy martyrs who preferred Christ to their own life.
Since the first century, Christians made Sunday the Christian Sabbath and kept Saturday as the Jewish Sabbath.
