John 5:1

This miraculous cure is not recorded by any other of the evangelists, who confine themselves mostly to the miracles wrought in Galilee, but John relates those wrought at Jerusalem. Concerning this observe, I. The time when this cure was wrought: it was at a feast of the Jews, that is, the passover, for that was the most celebrated feast. Christ, though residing in Galilee, yet went up to Jerusalem at the feast, Joh 5:1. 1. Because it was an ordinance of God, which, as a subject, he would observe, being made under the law; though as a Son he might have pleaded an exemption. Thus he would teach us to attend religious assemblies. Heb 10:25. 2. Because it was an opportunity of good; for, (1.) there were great numbers gathered together there at that time; it was a general rendezvous, at least of all serious thinking people, from all parts of the country, besides proselytes from other nations: and Wisdom must cry in the places of concourse, Pro 1:21. (2.) It was to be hoped that they were in a good frame, for they came together to worship God and to spend their time in religious exercises. Now a mind inclined to devotion, and sequestering itself to the exercises of piety, lies very open to the further discoveries of divine light and love, and to it Christ will be acceptable. II.

— Matthew Henry's Concise Commentary (public domain)