The Lords Day

 

Revelation 1:10

I was in the Spirit on the Lord's day, and I heard behind me a loud voice like a trumpet

Acts 20:7

On the first day of the week, when we were gathered together to break bread, Paul talked with them, intending to depart on the next day, and he prolonged his speech until midnight. 

1 Corinthians 16:2

On the first day of every week, each of you is to put something aside and store it up, as he may prosper, so that there will be no collecting when I come.