Adam Clarke on Acts 10:23

Then called he them in, etc. - They had already walked a long journey in a short time, and needed refreshment; and it was thought expedient they should rest that night with Simon the tanner.

Certain brethren from Joppa - They were six in number, as we learn from Act 11:12. It was necessary that there should be several witnesses of the important transactions which were about to take place; as on no slight evidence would even the converted Jews believe that repentance unto life, and the Holy Spirit, should be granted to the Gentiles.