Built there an altar - This affords some evidence that this was not a regular place of worship, else an altar would have been found in the place; and their act was not according to the law, as may be seen in several places of the Pentateuch. But there was neither king nor law among them, and they did whatever appeared right in their own eyes.
It is not certain whether the brass altar was at Bethel at this time, or whether it may not have been elsewhere, e. g., at Shiloh with the tabernacle. Some, however, think that the altar here mentioned was “additional” to the brass altar, in consequence of the unusual number of sacrifices caused by the presence of the whole congregation (compare 1 Kings 8:64 note).