The grove. This was the graven image of the Asherah that Manasseh had made (ch. 21:3,7).
Burned it. The Asherah was probably made of wood, which would burn, with a metal overlay (see Deut. 7:25).
To powder. This is similar to the treatment accorded the golden calf in the wilderness (Ex. 32:20).
Children of the people. That is, the common people. The same expression occurs in Jer. 26:23, where it is thus translated. The common people were not buried in rock-hewn sepulchers but in ordinary graves. Since graves were considered unclean, the burial plot in the ravine of the Kidron was considered an appropriate place for the powder of the ruined idols.