2 Chron 29:34
34 But the priests were too few, so that they could not flay all the burnt offerings: wherefore their brethren the Levites did help them, till the work was ended, and until the other priests had sanctified themselves: for the Levites were more upright in heart to sanctify themselves than the priests.
Although there have always been ebbs and tides in the quality of the priesthood in the history of Israel and Judah, God has always left a remnant in the midst of His people who would remain upright in heart. While God has often used prophets, judges and even civil servants for such a task, in this instance, it was the Levites who were found faithful due to their willingness to remain faithful to God. Although all priests were apart of the Levitical order, all Levites were not priests; these performed a variety of services (such as singers, scribes, judges etc.) throughout the sanctuary and among the people. And this parallel resembles the body of Christ today. For while some men are full time stewards in the house of God, other members serve in helps ministries as well as fulfilling their own vocational calling in their respective careers and callings in the civic sphere. Yet, most importantly, we find here that God was no respecter of persons in describing the Levites as more upright in heart than the priests; He regarded not the titles of the men who served Him but ther hearts.
“For the LORD seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.”- 1 Samuel 16:7