That they might be encouraged - i. e. to devote themselves wholly to their proper work, the service of the sanctuary and the teaching of God‘s Law 2 Chronicles 17:7-9, and not engage in secular occupations. Compare Nehemiah 13:10-14.
SDA Bible Commentary (limited)
Volume 1-7
4. Portion of the priests. The people were instructed to give to the priests and the Levites the tithes and first fruits (v.5) commanded by Moses (Num. 18:12-30).
Might be encouraged.Heb.chazaq, meaning basically “to be strong,” “to be firm.” Here it seems to have the meaning, “to fulfill strictly.” With adequate support the priests and Levites would have no necessity of engaging in worldly pursuits (see Neh. 13:10-14).