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John Gill
And the disciples of John showed him of all these things. The miracles that were wrought by Christ; particularly the healing of the centurion's servant, and the raising from the dead the widow of Naim's son, and what fame and reputation Christ got every where by his doctrine, and mighty works. John was now in prison, when these his disciples came and related these things to him; see Matthew 11:2...
Matthew Henry
In this chapter we have, I. Christ confirming the doctrine he had preached in the former chapter, with two glorious miracles—the curing of one at a distance, and that was the centurion's servant (ver. 1-10), and the raising of one to life that was dead, the widow's son at Nain, ver. 11-18. II. Christ confirming the faith of John who was now in prison, and of some of his disciples, by sending him...
Charles H. Spurgeon
And the disciples of John shewed him of all these things. John was in prison, and, possibly, troubled in spirit.