For Hashem will pass through to strike the Mitzrayim; and when He seeth the dahm upon the mashkof, and on the two mezuzot, Hashem will pasach (pass over, spare, skip) the entrance, and will not permit the Mashkhit (Destroyer, i.e., Hashem's emissary of judgment, [see Num 22:31 on the Malach Hashem]) to enter unto your batim to strike.