וַיִּשָּׂאֻ֗הוּ מִבֵּ֤ית אֲבִֽינָדָב֙ אֲשֶׁ֣ר בַּגִּבְעָ֔ה עִ֖ם אֲר֣וֹן הָאֱלֹהִ֑ים וְאַחְי֕וֹ הֹלֵ֖ךְ לִפְנֵ֥י הָאָרֽוֹן׃
And they brought it out of the house of Abinadab, which was in the hill, with the ark of God, and Ahio went before the ark.
Rashi on II Samuel
With the Ark of Elokim. This is a shortened verse, [it means to say] and they were coming with the Ark of Elokim.