These were counted from the Merarite clans, whom Moses and Aaron numbered at the LORD’s command through Moses.
KJV
These [be] those that were numbered of the families of the sons of Merari, whom Moses and Aaron numbered according to the word of the LORD by the hand of Moses.
ASV
These are they that were numbered of the families of the sons of Merari, whom Moses and Aaron numbered according to the commandment of Jehovah by Moses.