Mosera, by Mount Hor, for there Aaron died, Numbers xx. This and the following verses seem to be inserted by way of parenthesis, (Challoner) as far as the 10th. The reason of their insertion here cannot easily be explained; but we must adore, in silence, the designs of the Holy Spirit. (Calmet)

Moses had just mentioned the ark, designed to contain the tables of the law; and as the priests and Levites were to be the guardians of those sacred things, he takes occasion to specify something with respect to their institution, &c. Mosera was perhaps twice visited by the Hebrews. The first time, they came thither from Beroth-Benejaacan, or from “the well of the children of Jacan,“ and thence measured back their steps; though, the second time, Mosera, or Moseroth, is not noticed, because it had been specified already, and they did not stop long there, but proceeded to Gadgad, Numbers xxxiii. 30. (Bonfrere) (Menochius)

Others think that Mosera and Benejaacan are not the same places as Moseroth and Beroth Bensacan, though the names be similar. (Cornelius a Lapide)

Perhaps it will be more satisfactory to acknowledge, that Mosera has been transposed by the copyists, as it ought to come before Beroth, particularly as Moses places it in that order, where he gives an account of the 42 stations; and the Samaritan copy agrees with him in this place. (Calmet)

It also retains many words which have been omitted in Hebrew, and in all the versions taken from it; whence the omission seems to have taken place before the appearance of the version of the Septuagint. The Samaritan version, which is acknowledged to have preceded the Septuagint, agrees with its text, and reads, “And the children of Israel journeyed from Moseroth, and pitched in Benejaakan: from thence they journeyed, and pitched in Hagidgad: from thence they journeyed, and pitched in Jotbathah, a land of rivers of waters: from thence they journeyed, and pitched in Ebronah: from thence they journeyed, and pitched in Eziongaber: from thence they journeyed, and pitched in the wilderness of Zin, which is Kadesh: from thence they journeyed, and pitched in Mount Hor. And there Aaron died,” &c. (Kennicott, 2. Dis.)

Thus Mosera will be the 27th, and Mount Hor the 34th station; (Pococke) whence the Israelites departed, after the death of Aaron, to Salmona, directing their course to the countries east of the Jordan, which had been promised to them. The appointment of Eleazar to succeed Aaron, and the separation of the Levites unto the Lord, should be all placed together, after the different encampments. (Haydock)