Maleakhi 3:2

3:2 Who can endure the day of his coming? Who can keep standing when he appears? For he will be like a refiner’s fire, ¹  like a launderer’s soap.

Maleakhi 4:3

4:3 You will trample on the wicked, for they will be like ashes under the soles of your feet on the day which I am preparing,” says the Lord who rules over all.

[3:2]  ¹ sn The refiner’s fire was used to purify metal and refine it by melting it and allowing the dross, which floated to the top, to be scooped off.