John Gill

Which when the brethren knew,.... When the members of the church heard of it, by some means or another: they brought him down to Caesarea; not that which was before called Strato's tower, the same as in Act 8:40 but Caesarea Philippi, mentioned in Mat 16:13 the Syriac version adds, "by night", and some copies, "and sent him forth to Tarsus"; a city of Cilicia, his own native place, where he might be more safe, and also useful among his friends and acquaintance; Gal 1:21.