'Of the Flesh' in the Bible

And there shall be no leaven seen with thee in all thy borders seven days; neither shall any of the flesh, which thou sacrificedst at even on the first day, be left over night until the morning. --

so that he will not give to any of them of the flesh of his children that he eateth, because he hath nothing left him in the siege and in the straitness wherewith thine enemies shall distress thee in all thy gates.