'Rod' in the Bible

"And I will make you pass under the rod, and I will bring you into the bond of the covenant.

It is sharpened to slaughter a slaughter, {polished to flash like lightning}! Or will we rejoice? A rod, my son, [is] despising every tree.

For {examine}! And what if also [the] rod will not be despising?' {declares} the Lord Yahweh.