http://www.christiananswers.net/q-acb/acb-t007.html
At the very beginning, the church in Jerusalem met every day in the temple and in private homes (
Acts 2:46). Since the first believers were all Jewish, it seems safe to assume that they continued to participate in Jewish synagogue and temple worship for some time.
However, the New Testament makes it clear that the observance of a particular day was not imposed as a binding obligation.
Romans 14:5-6 makes it clear that there was some freedom in the matter of special days.
Colossians 2:16-17 commanded the church not to allow anyone to act as their judge in regard to sabbath days. And
Galatians 4:9-10 warns against going back under the Law by insisting on the legal requirement of special days.
The records that remain in the New Testament show that the first day of the week soon became a day of worship. When Paul wanted to collect an offering from the church at Corinth, he asked them to gather the money on the "first day of the week" (
1 Cor. 16:2). And when he wanted to meet with the believers at Troas, the gathering took place "on the first day of the week, when we were gathered together to break bread" (
Acts 20:7).