Luke
Acts 21:23ESV·traditional attribution

Do therefore what we tell you. We have four men who are under a vow;

John Calvin Reformed @genevareformer

23. Do that which we say to thee. The elders seem (as I said even now) to be fallen unto a foolish pampering [indulgence] through too much love of their nation. But the manifest judgment of that thing “Liquidum ejus rei judicium,” a clear judgment on the case. dependeth upon the circumstances which are hid from us at this day: yet they knew them well.

Matthew Henry Presbyterian @wholebiblehenry

In these verses we have, I. Paul's journey to Jerusalem from Caesarea, and the company that went along with him. 1. They took up their carriages, their bag and baggage, and as it should seem, like poor travellers or soldiers, were their own porters; so little had they of change of raiment. Omnia mea mecum porto - My property is all about me.

Commenting on Acts 21:15-26

John Gill Reformed Baptist @doctorgill

Do therefore this that we say to thee,.... This is said not as commanding, but as advising; and not to what was a duty, and necessary to be done as such, but as a point of prudence: we have four men which have a vow on them; that is, there were four men who were of the church at Jerusalem, believers in Christ, but weak...