Charles H. Spurgeon on Psalms 26:6

By the phrase compassing the altar, either he alludes to some Levitical custom of going about the altar, as the priests did in the oblation of their sacrifices; and the people, especially those of them who were more devout and zealous, who possibly moved from place to place, but still within their own court, that they might discern what was done on the several sides of the altar, and so be more affected with it; or rather he implies that he would offer many sacrifices together, which would employ the priests round about the altar. Matthew Poole.