Observe, I. There were porters appointed to attend the temple, who guarded all the avenues that let to it, opened and shut all the outer gates and attended at them, not only for the state, but for service, to direct and instruct those who were going to worship in the courts of the sanctuary in the decorum they were to observe, to encourage those that were timorous, to send back the strangers and unclean, and to guard against thieves and others that were enemies to the house of God. In allusion to this office, ministers are said to have the keys to the kingdom of heaven committed to them (Mat 16:19), that they may admit, and exclude, according to the law of Christ.
II. Of several of those that were called to this service, it is taken notice of that they were mighty men of valour (Ch1 26:6), strong men (Ch1 26:7), able men (Ch1 26:8), and one of them that he was a wise counsellor (Ch1 26:14), who probably, when he had used this office of a deacon well and given proofs of more than ordinary wisdom, purchased to himself a good degree, and was preferred from the gate to the council-board, Ti1 3:13. As for those that excelled in strength of body, and courage and resolution of mind, they were thereby qualified for the post assigned them; for whatever service God calls men to he either finds them fit or makes them so.
III. The sons of Obed-edom were employed in this office, sixty-two of that family. This was he that entertained the ark with reverence and cheerfulness; and see how he was rewarded for it. 1. He had eight sons (Ch1 26:5), for God blessed him. The increase and building up of families are owing to the divine blessing; and a great blessing it is to a family to have many children, when like these they are able for, and eminent in, the service of God. 2. His sons were preferred to places of trust in the sanctuary. They had faithfully attended the ark in their own house, and now were called to attend it in God's house. He that is trusty in little shall be trusted with more. He that keeps God's ordinances in his own tent is fit to have the custody of them in God's tabernacle, Ti1 3:4, Ti1 3:5. I have kept thy law, says David, and this I had because I kept thy precepts, Psa 119:55, Psa 119:56.
IV. It is said of one here that though he was not the first-born his father made him the chief (Ch1 26:10), either because he was very excellent, or because the elder son was very weak. He was made chief, perhaps not in inheriting the estate (for that was forbidden by the law, Deu 21:16, Deu 21:17), but in this service, which required personal qualifications.
V. The porters, as the singers, had their post assigned them by lot, so many at such a gate, and so many at such a one, that every one might know his post and make it good, Ch1 26:13. It is not said that they were cast into twenty-four courses, as before; but here are the names of about twenty-four (Ch1 26:1-11), and the posts assigned are twenty-four, Ch1 26:17, Ch1 26:18. We have therefore reason to think they were distributed into as many companies. Happy are those who dwell in God's house: for, as they are well fed, well taught, and well employed, so they are well guarded. Men attended at the gates of the temple, but angels attend at the gates of the New Jerusalem, Rev 21:12.

Eastward were six Levites - It is supposed that there were more guards set at this eastern gate, because it was more frequented than the others. At each of the other gates were only four; at this, six.

These are the divisions of the porters among the sons of Kore, and among the sons of Merari. For among those Levites which descended from Kore, a grandson of Kohath, and which sprung from Merar, a brother of Kohath, the porters only wore; see Ch1 26:1.
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1 Chronicles 26:20

ch1 26:20
ch1 26:20
ch1 26:20And of the Levites,.... The rest of the Levites, as the Gershonites, Amramites, Izharites, and Hebronites, Ch1 26:21.

Ahijah was over the treasures of the house of God; as the tithes, vessels, vestments, wine, and oil, and other things; such an one was Phinehas at the time of the destruction of Jerusalem by Vespasian, who being taken, showed and delivered the priests' garments, and many other precious things and sacred ornaments under his care (e): and over the treasures of the dedicated things; voluntarily devoted for sacrifices and repairs of the temple; and this Ahijah had the care of each of those at first, which afterwards were divided, and put under the care of different persons.

(e) Joseph. de Bell. Jud. l. 6. c. 8. sect. 3.

Eastward were six Levites--because the gate there was the most frequented. There were four at the north gate; four at the south, at the storehouse which was adjoining the south, and which had two entrance gates, one leading in a southwesterly direction to the city, and the other direct west, two porters each. At the Parbar towards the west, there were six men posted--four at the causeway or ascent (Ch1 26:16), and two at Parbar, amounting to twenty-four in all, who were kept daily on guard.