The Greek word for “immediately” (1:29; NIV “as soon as”)—which occurs eleven times in Mark 1—contributes to the sense of urgency in Mark’s narrative: the time is at hand (1:15) for the authority of God’s Son to bear witness to the gospel. Close to the synagogue is Peter’s house, where Jesus heals Peter’s mother-in-law of a fever (1:30–31). The Greek word for “wait on” (1:31) is diakoneō, from which “deacon” is derived. Mark’s use of this word to describe Peter’s mother-in-law serving the company following her healing may have been included to remind the members of the church in Rome to which he is writing to use the gifts, health, and opportunities…
Baker Publishing Group, The Baker Illustrated Bible Commentary, by Gary M. Burge