וַיְהִ֗י בִּתְחִלַּת֙ שִׁבְתָּ֣ם שָׁ֔ם לֹ֥א יָרְא֖וּ אֶת־יְהוָ֑ה וַיְשַׁלַּ֨ח יְהוָ֤ה בָּהֶם֙ אֶת־הָ֣אֲרָי֔וֹת וַיִּֽהְי֥וּ הֹרְגִ֖ים בָּהֶֽם׃
And so it was, at the beginning of their dwelling there, that they feared not the LORD; therefore the LORD sent lions among them, which killed some of them.
Read kabbalistic (mystical) interpretation of II Kings 17:25: and classical mystical sources.