A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
1 Chronicles 13:1
ch1 13:1DAVID FETCHES THE ARK FROM KIRJATH-JEARIM. (Ch1 13:1-8)
David consulted . . . And let us bring again the ark of our God--Gratitude for the high and splendid dignity to which he had been elevated would naturally, at this period, impart a fresh animation and impulse to the habitually fervent piety of David; but, at the same time, he was animated by other motives. He fully understood his position as ruler under the theocracy, and, entering on his duties, he was resolved to fulfil his mission as a constitutional king of Israel. Accordingly, his first act as a sovereign related to the interests of religion. The ark being then the grand instrument and ornament of it, he takes the opportunity of the official representatives of the nation being with him, to consult them about the propriety of establishing it in a more public and accessible locality. The assembly at which he spoke of this consisted of the Sheloshim, princes of thousands (Sa2 6:1). During the reign of the late king, the ark had been left in culpable neglect. Consequently the people had, to a great extent, been careless about the ordinances of divine worship, or had contented themselves with offering sacrifices at Gibeon, without any thought of the ark, though it was the chief and most vital part of the tabernacle. The duty and advantages of this religious movement suggested by the king were apparent, and the proposal met with universal approval.
1 Chronicles 13:2
ch1 13:2If it seem good unto you, and . . . it be of the Lord--that is, I shall conclude that this favorite measure of mine is agreeable to the mind of God, if it receive your hearty concurrence.
let us send abroad to our brethren everywhere--He wished to make it known throughout the country, in order that there might be a general assembly of the nation, and that preparations might be made on a scale and of a kind suitable to the inauguration of the august ceremonial.
with them also to the priests and Levites . . . in their cities and suburbs--(See on Num 35:2). The original terms, "Let us send," imply immediate execution; and, doubtless, the publication of the royal edict would have been followed by the appointment of an early day for the contemplated solemnity, had it not been retarded by a sudden invasion of the Philistines, who were twice repulsed with great loss (Sa2 5:17), by the capture of Jerusalem, and the transference of the seat of government to that city. Finding, however, soon after, peace restored and his throne established, he resumed his preparations for removing the ark to the metropolis.
1 Chronicles 13:5
ch1 13:5from Shihor of Egypt-- (Jos 15:4, Jos 15:47; Num 34:5; Kg1 8:65; Kg2 24:7; Ch2 7:8); a small brook flowing into the Mediterranean, near the modern El-arish, which forms the southern boundary of Palestine.
unto the entering of Hemath--the defile between the mountain ranges of Syria and the extreme limit of Palestine on the north.
1 Chronicles 13:6
ch1 13:6David went up, and all Israel, to Baalah--(See on Sa2 6:1-11).
whose name is called on it--rather, "who is worshipped there" (Sa2 6:2).