Clarke's Bible Commentary - Nehemiah 12:47
Verse 47. All Israel-gave the portions of the singers] The singers and the porters were supported by the people at large; and each of these had their portions served out to them daily. And they sanctified-unto the Levites] The things which were provided for sacred uses were delivered by the people to the Levites, and the Levites presented them to the priests.
The children of Aaron.] This may refer principally to the tithes which the people brought to the Levites; the tithe or tenth of which the Levites gave to the priests. The presenting these tithes is termed sanctifying them; that is, dedicating them to those sacred or ecclesiastical uses for which they were designed: this is a very general meaning of the word sanctify in Scripture.