Adam Clarke on Acts 21:5

When we had accomplished those days - That is, the seven days mentioned in the preceding verse.

And they all brought us on our way, with wives and children - It is not likely that Paul, Silas, Luke, etc., had either wives or children with them; and it is more natural to suppose that the brethren of Tyre, with their wives and children are those that are meant; these, through affection to the apostles, accompanied them from their homes to the ship; and the coming out of the husbands, wives, and children, shows what a general and affectionate interest the preaching and private conversation of these holy men had excited.

Kneeled down on the shore, and prayed - As God fills heaven and earth, so he may be worshipped every where; as well, when circumstances require it, on the seashore as in the temple. We have already seen, in the case of Lydia, that the Jews had proseuchas by the river sides, etc.; and an observation in Tertullian seems to intimate that they preferred such places, and in the open air offered their petitions to God by the seashore: Omissis templis, per omne littus, quocumque in aperto aliquando jam preces ad coelum mittunt. Tertul. de Jejunio.