| Gill's Exposition of the Entire Bible All they that were numbered in the camp of Dan were an hundred thousand and fifty and seven thousand and six hundred,.... 157,600 men. Consisting of his own tribe, and those of Asher and Naphtali, which make the largest camp next to Judah: they shall go hindmost with their standards; for though, while encamped, they lay to the north, or the left side of the tabernacle, yet, when marching, they brought up the rear, and were the rear guard to the tabernacle; so that it had in its van and rear the two largest camps, which were wisely ordered for its safety: "standards" is put for "standard", the plural for the singular; for there was but one standard to a camp, unless this takes in their ensigns, of which they had many.
Keil and Delitzsch Biblical Commentary on the Old Testamentלדגליהם (according to their standards) is equivalent to לצבאתם (according to their hosts) in Numbers 2:9, Numbers 2:16, and Numbers 2:24, i.e., according to the hosts of which they consisted.
Geneva Study BibleAll they that were numbered in the camp of Dan were an hundred thousand and fifty and seven thousand and six hundred. They shall go hindmost with their standards.
Wesley's Notes 2:31 The Camp of Dan - The strongest camp next after Judah, and therefore he comes in the rear, as Judah marched in the front, that the tabernacle might be best guarded where there was most danger.
Matthew Henry's Concise Commentary2:1-34 The order of the tribes in their tents. - The tribes were to encamp about the tabernacle, which was to be in the midst of them. It was a token of God's gracious presence. Yet they were to pitch their tents afar off, in reverence to the sanctuary. The children of Israel put themselves in their posts, without murmuring or disputing; and as it was their safety, so it was their beauty. It is our duty and interest to be contented with the place allotted to us, and to endeavour to occupy it in a proper manner, without envying or murmuring; without ambition or covetousness. Thus the gospel church ought to be compact, according to the Scripture model, every one knowing and keeping his place; and then all that wish well to the church rejoice, beholding their order, Col 2:5. | 
