Others, of the sons of the priests, prepared the mixing of the spices,
We have here a further account of the good posture which the affairs of religion were put into immediately upon the return of the people out of Babylon. They had smarted for their former neglect of ordinances and under the late want of ordinances.
Commenting on 1 Chronicles 9:14-34
These chief fathers of the Levites were chief throughout their generations,.... Even all before made mention of in this chapter: these dwelt at Jerusalem; always resided there, and did not in turns go into the country villages, as the inferior Levites did; their office requiring them to be constantly there, being chief of the porters, singers, &c. who had the superintendency and direction of the rest.
The sons of the priests made the ointment - Only the priests were permitted to make this ointment; all others were forbidden to do it on pain of death; see Exo 30:34-38 (note), and the notes there.