2 Then David said, "No one ought to carry the ark of God but the Levites. For Yahweh has chosen them to carry the ark of God, and to minister to him forever."
*Minor differences ignored. Grouped by changes, with first version listed as example.
None ought to carry the ark of God but the Levites - Compare marginal references. We can easily understand that David, after the "breach upon Uzza" 1-Chronicles 13:11, had carefully considered all the legal requirements with respect to moving the ark, and was anxious that they should be strictly observed (compare 1-Chronicles 15:13).
None ought to carry the ark - but the Levites - It was their business; and he should have thought of this sooner, and then the unfortunate breach on Uzza would have been prevented; see 1-Chronicles 15:13.
Then David said,.... Either within himself, or to his ministers and courtiers about him:
none ought to carry the ark of God but the Levites; he saw his former mistake in employing those that were not Levites in bringing up the ark from Kirjathjearim, and bringing it in a cart, and not on the shoulders of the Levites, and so miscarried in his attempt, 2-Samuel 6:1 and, perhaps, had since more diligently consulted the law of God about this matter:
for them hath the Lord chosen to carry the ark of God, and to minister unto him for ever; as long as the Levitical dispensation lasted, as appears from Numbers 1:50.
Then David said, None ought to carry the ark of God but the Levites--After the lapse of three months (1-Chronicles 13:14) the purpose of transporting the ark to Jerusalem was resumed. Time and reflection had led to a discovery of the cause of the painful catastrophe that marred the first attempt. In preparing for the solemn procession that was now to usher the sacred symbol into its resting-place, David took special care that the carriage should be regulated in strict conformity to the law (Numbers 4:5, Numbers 4:15; Numbers 7:9; Numbers 10:17).
The reason for the preparations made on this occasion for the solemn progress is assigned in the statement that David had resolved to cause the ark to be carried by the Levites alone, because God had chosen them thereto; cf. Numbers 1:50; Numbers 4:15; Numbers 7:9; Numbers 10:17. אז, "at that time," i.e., at the end of the three months, 1-Chronicles 13:14. לשׂאת לא, "there is not to bear," i.e., no other shall bear the ark than the Levites. "By this arrangement, it is expressly acknowledged that it was contrary to the law to place it upon a cart; 1-Chronicles 13:1-14 :17" (Berth.). For this purpose, the king assembled "the whole of Israel" in Jerusalem, i.e., the elders, the rulers over thousands, the heads of families; cf. 2-Samuel 6:15, where it is stated that ישׂאל כּל־בּית took part in the solemn march.
*More commentary available at chapter level.