Acts 9:40 - Ellicott's Commentary On The Whole Bible

Peter put them all forth. — We may, perhaps, trace in Peter’s action his recollection of what our Lord had done in the case of the daughter of Jairus (see Notes on Matthew 9:23-24), at which he had been present. The work was one not to be accomplished by the mere utterance of a name, nor as by his “own power or holiness” (Acts 3:12), but by the power of the prayer of faith, and this called for the silence and solitude of communion with God. Even the very words which were uttered, if he spoke in Aramaic, must have been, with the change of a single letter, the same as the Talitha cumi of Mark 5:41. The utterance of the words implied the internal assurance that the prayer had been answered.