C. F. Keil and Franz Delitzsch on 1 Chronicles 15:13

1Ch 15:13 “For because in the beginning (i.e., when the ark was removed from the house of Amminadab, 1Ch 13:1-14) it was not you (sc., who brought it up), did Jahve our God made a breach upon us,” sc. by the slaying of Uzza, 1Ch 13:11. In the first clause the predicate is wanting, but it may easily be supplied from the context. The contracted form למבּרשׁונה, made up of למה and בּראשׁונה, is unique, since מה is so united only with small words, as in מזּה, Exo 4:2, מלּכם, Isa 3:15; but we find מתּלאה for מה־תּלאה, Mal 1:13; cf. Ew. §91, d. למה here signifies: on account of this which = because; cf.'Ew. §222, a, and 353, a. “This was done, because we did not seek Him according to the right,” which required that the ark, upon which Jehovah sits enthroned, should be carried by Levites, and touched by no unholy person, or one who is not a priest (Num 4:15).