Leviticus 8:35

Abide at the door of the tabernacle day and night Apply yourselves assiduously to the service of God and the business of your consecration. Let nothing divert you from your sacred duty. Gospel ministers are compared to those that served at the altar, (1 Corinthians 9:13,) and being solemnly dedicated to God, ought not to depart from his service, but faithfully abide in it all their days; and they that do so, and continue labouring in the word and doctrine, ought to be counted worthy of double honour, double to that of the Old Testament priests.