Iron: First Recorded Use of Yokes
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Deuteronomy 28:48
you will serve your enemies the LORD will send against you in famine, thirst, nakedness, and destitution. He will place an iron yoke on your neck until He has destroyed you.
Jeremiah 28:13, 14
“Go and tell Hananiah that this is what the LORD says: ‘You have broken a yoke of wood, but in its place you have fashioned a yoke of iron.’ / For this is what the LORD of Hosts, the God of Israel, says: ‘I have put a yoke of iron on the neck of all these nations to make them serve Nebuchadnezzar king of Babylon, and they will serve him. I have even given him control of the beasts of the field.’”