Rashi on II Kings
A jar of oil. Enough oil for anointment [=אָסוּךְ], and the ‘א’ is part of the root,3Alternatively, the root is סוך, and the ‘א’ is an added prefix.—Radak like the ‘א’ of, “and my speech [=וְאַחְוָתִי] in your ears,”4Iyov 13:17. and the ‘א’ of, “the dread [=אִבְחַת] of those struck down by the sword.”5Yechezkeil 21:20.