Revelation 1:10 And I was in the spirit on the first [day] of the week…
The Aramaic has “first [day] of the week”. The Greek translator
rendered this “the Lord’s Day”. There is no worship service involved
in this passage. The event took place at the time of the firstfruits
offering, which always occurs on the day after a Sabbath during
Passover (Lev. 23:9-14) it begins the counting of seven seeks (forty
nine days) until Shavuot (Pentecost) (Lev. 23:15-22). The Book of
Revelation is filled with firstfruits and Passover imagery (the lamb, the firstborn etc.). After telling is this was the first day of the week, the text tells us that Yochanan sees seven menorah’s of gold (1:12) (each menorah has seven branches 7×7=49). These were representing the 49 days counted from the firstfruits offering on the first day of the week during Passover, until Shavuot.