Yehezkiel 22:17-18

22:17 The word of the Lord came to me: 22:18 “Son of man, the house of Israel has become slag to me. All of them are like bronze, tin, iron, and lead in the furnace; ¹  they are the worthless slag of silver.

[22:18]  ¹ tn For similar imagery, see Isa 1:21-26; Jer 6:27-30.