Charles Ellicott Commentary Mark 1:29

"And straightway, when they were come out of the synagogue, they came into the house of Simon and Andrew, with James and John." — Mark 1:29 (ASV)

And forthwith.—Again we have St. Mark’s characteristic word, as in the “immediately” of Mark 1:28, and in the “anon” of Mark 1:30. (See Notes on Matthew 8:14-15.)