Albert Barnes Commentary Mark 1:21

"And they go into Capernaum; and straightway on the sabbath day he entered into the synagogue and taught." — Mark 1:21 (ASV)

And they went into Capernaum. For the situation of Capernaum, see Matthew 4:13.

Straightway. Immediately. On the following Sabbath.

The synagogue. See Barnes on Matthew 4:23.

And taught. In the synagogue, the presiding elder, after reading the Scriptures, invited any who chose to address the people (Acts 13:15). Though our Saviour was not a priest of the Levitical order, or an officer of the synagogue, yet we find him often availing himself of this privilege and delivering his doctrines to the Jews.