'Rod' in the Bible

But of the Son he says, Your seat of power, O God, is for ever and ever; and the rod of your kingdom is a rod of righteousness.

Which had the golden censer, and the ark of the covenant overlaid round about with gold, wherein was the golden pot that had manna, and Aaron's rod that budded, and the tables of the covenant;

For the Lord sends punishment on his loved ones; everyone whom he takes as his son has experience of his rod.