Matthew Poole and continuators on Jeremiah 39:6

6 Then the king of Babylon slew the sons of Zedekiah in Riblah before his eyes: also the king of Babylon slew all the nobles of Judah .

Thus the stubbornness of this Prince, and his Nobles, proved the Ruine of his Family, and of themselves, and of the whole people. The Nobles were great Authors of this mischief and brought Zedekiah into that obstinacy which he shewed to the Prophets admonitions and exhortations upon them, therefore a more exemplary punishment is taken. The Hebrew calls the Nobles white men, either from their white garments, or from that Candor of Spirit which should be found in persons of their Quality.