תְּ֭רֹעֵם בְּשֵׁ֣בֶט בַּרְזֶ֑ל כִּכְלִ֖י יוֹצֵ֣ר תְּנַפְּצֵֽם׃
Thou shalt break them with a rod of iron; Thou shalt dash them in pieces like a potter's vessel.'
Radak on Psalms
Thou shalt break (הרעם) them with a rod of iron: – And so He says to me of all the nations that shall rise up against me, Thou shalt break them with a rod of iron.