Why Set Aside on the First Day of the Week?

 

I see two possibilities about why Paul instructed the Corinthians to save a little on the side on the first day of the week instead of on some other day.

 

1. Because the first day of the week was not holy, and that's when "acts of worship" were to be conducted. (This seems to be the most common view.)
2. Because the business week had concluded Friday at sundown, and there was not time to calculate the profits/losses of the week before the Sabbath started, when such calculation work was forbidden (at least for the Jewish believers who were still walking according to the law, as was Paul - Acts 21:24; at a minimum, this would have been a lifelong habit for the Jews converted there in Corinth (Acts 18:4)), and the first day of the week therefore was the day when the books would be balanced from the previous work week, and when it made the most sense to ear-mark a part of the week's intake for the Judean fund-raiser.