This phrasing is found later in the Book of Acts and the first letter to the Corinthians and misused as proof texts for Sunday keeping.
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But we sailed away from Philippi after the Days of Unleavened Bread and in five days joined them at Troas where we stayed seven days. Now on the first day of the week, when the disciples came together to break bread, Paul, ready to depart the next day, spoke to them and continued his message until midnight. (Acts 20:6-7)
I have seen people try to use Acts 20:7 to establish Sunday observance, but does it really? It seems they often fail to mention the preceding verse about the Days of Unleavened Bread.
The Days of Unleavened Bread occur annually from Nisan 15 through Nisan 21. During this seven day period there are normally three Sabbaths, two annual Sabbaths and the weekly Sabbath. Occasionally one of the annual Sabbaths will coincide with the weekly Sabbath and there will only be two Sabbaths during Unleavened Bread.
Paul stayed at Troas seven days which would be Monday through Sunday. Luke does not tell us whether Paul spoke at the synagogue on the Sabbath but he does say that when the people broke bread that evening (the beginning of Sunday) he spoke until daybreak Sunday morning.
Paul evidently had a lot to say to the people of Troas and he wanted to get it in before the people continued their harvest the next day and Paul moved on. Paul wanted to be in Jerusalem for Pentecost.
There is nothing about Paul's all night speaking that established a precedent for Sunday observance. If anything it establishes the observance of Unleavened Bread. Too bad that is usually skipped over.