The Sabbath: First Day of the Week Kept As, by the Church
Source: TTT
John 20:26
Eight days later, His disciples were once again inside with the doors locked, and Thomas was with them. Jesus came and stood among them and said, “Peace be with you.”
Acts 20:7
On the first day of the week we came together to break bread. Since Paul was ready to leave the next day, he talked to them and kept on speaking until midnight.
1 Corinthians 16:2
On the first day of every week, each of you should set aside a portion of his income, saving it up, so that when I come no collections will be needed.