1 Tawarikh 23:28

23:28 Their job was to help Aaron’s descendants in the service of the Lord’s temple. They were to take care of the courtyards, the rooms, ceremonial purification of all holy items, and other jobs related to the service of God’s temple. ¹ 

Yesaya 1:25

1:25 I will attack you; ² 

I will purify your metal with flux. ³ 

I will remove all your slag. ⁴ 

[23:28]  ¹ tn Heb “For their assignment was at the hand of the sons of Aaron for the work of the house of the Lord concerning the courtyards and concerning the rooms and concerning the purification of all holiness and the work of the service of the house of God.”

[1:25]  ² tn Heb “turn my hand against you.” The second person pronouns in vv. 25-26 are feminine singular. Personified Jerusalem is addressed. The idiom “turn the hand against” has the nuance of “strike with the hand, attack,” in Ps 81:15 HT (81:14 ET); Ezek 38:12; Am 1:8; Zech 13:7. In Jer 6:9 it is used of gleaning grapes.

[1:25]  ³ tn Heb “I will purify your dross as [with] flux.” “Flux” refers here to minerals added to the metals in a furnace to prevent oxides from forming. For this interpretation of II בֹּר (bor), see HALOT 153 s.v. II בֹּר and 750 s.v. סִיג.

[1:25]  ⁴ sn The metaphor comes from metallurgy; slag is the substance left over after the metallic ore has been refined.