Tafsiran Mazmur 2:10: Rashi, Radak & Ibn Ezra

And now, [you] kings, be wise The Jewish prophets are merciful people. They reprove the heathens to turn away from their evil, for the Holy One, blessed be He, extends His hand to the wicked and to the righteous.

Now therefore, O ye kings: – David said to them, to the kings who came to fight him, “O kings!”

And now, O kings (וְ֭עַתָּה מְלָכִ֣ים - ve-attah melakhim): These are the "kings of the earth" [mentioned in verse 2].