John Gill Bible Commentary

And when he had declared all these things unto them,.... Which he had heard and seen in the vision, and of which he gave them a particular account; partly to engage them the more cheerfully to go on the errand, and partly that they might be able to give a distinct relation of it to Peter, that so he might be moved the more to comply with the request, and come along with them: he sent them to Joppa; perhaps not that evening, since it was at the ninth hour, or three o'clock in the afternoon, when Cornelius had the vision; and some time must be taken up in discourse with the angel, and afterwards in sending for his servants, and relating the affair to them, and giving them their proper instructions. So that it may be they did not set out till early the next morning, as seems from the following verse.