Originally meaning to sit beside or near, this verb developed the sense of constant attendance and devoted service. Classical usage included keeping watch, being always at someone's side, or applying oneself persistently to duties. Paul uses it in 1 Corinthians 9:13 regarding temple service: those attending to the altar get their share from the altar. The verb implies regular, devoted service—not occasional help but continuous attendance and faithful discharge of sacred duties, which merits participation in the altar's provision.