Numbers 4:20

When the holy things are covered - Literally, כבלע keballa , when they are swallowed down; which shows the promptitude with which every thing belonging to the holy of holies was put out of sight, for these mysteries must ever be treated with the deepest reverence; and indeed without this they could not have been to them the representatives of heavenly realities. See the concluding note Numbers 4:36 ; (note).