Midrasz do Królów II 19:31

VI) The zeal of the LORD (II Kings 19:31) is written, but a continuation of of Hosts is suspended to it in the margin, for great vengeance the LORD did against him first, but after that by the hands of the hosts of His angels. And thus it says And an angel of God came out and struck the camp of Assyria, a hundred and eighty-five thousand (II Kings 19:35), thus it is suspended outside to make known both of the vengeances that God avenged.