But the LORD hath taken you, and brought you forth out of the iron furnace, even out of Egypt, to be unto him a people of inheritance, as ye are this day.
1 Kings 8:51
For they be thy people, and thine inheritance, which thou broughtest forth out of Egypt, from the midst of the furnace of iron:
The words of the LORD are pure words: as silver tried in a furnace of earth, purified seven times.
Behold, I have refined thee, but not with silver; I have chosen thee in the furnace of affliction.
Which I commanded your fathers in the day that I brought them forth out of the land of Egypt, from the iron furnace, saying, Obey my voice, and do them, according to all which I command you: so shall ye be my people, and I will be your God: