'Iron' in the Bible

(For only Og king of Bashan was left of the remnant of the [the giants known as the] Rephaim. Behold, his bed frame was a bed frame of iron; is it not in Rabbah of the Ammonites? It was nine cubits (12 ft.) long and four cubits (6 ft.) wide, using the cubit of a man [the forearm to the end of the middle finger].)

But the Lord has taken you and brought you out of the iron [smelting] furnace, out of Egypt, to be a people for His own possession, as [you are] this day.

a land where you will eat bread without shortage, in which you will lack nothing; a land whose stones are iron, and out of whose hills you can dig copper.

There you shall build an altar to the Lord your God, an altar of stones; you shall not use an iron tool on them.

The heaven which is over your head shall be bronze [giving no rain and blocking all prayers], and the earth which is under you, iron [hard to plow and yielding no produce].

you will therefore serve your enemies whom the Lord sends against you, in hunger and in thirst, in nakedness and in lack of all things; and He will put an iron yoke [of slavery] on your neck until He has destroyed you.

“Your strongholds will be iron and bronze,And as your days are, so will your strength, your rest and security be.