John Lightfoot on Mark 14:7

[For ye have the poor with you always.] "Samuel saith, 'There is no difference between this world and the days of the Messias,' unless in regard of the affliction of the heathen kingdoms; as it is said, 'A poor man shall not be wanting out of the midst of the earth,'" Deuteronomy 15:11. Observe a Jew confessing, that there shall be poor men even in the days of the Messias: which how it agrees with their received opinion of the pompous kingdom of the Messias, let him look to it. "R. Solomon and Aben Ezra write, 'If thou shalt obey the words of the Lord, there shall not be a poor man in thee: but thou wilt not obey; therefore a poor man shall never be wanting.'" Upon this received reason of the thing, confess also, O Samuel, that there shall be disobedient persons in the days of the Messias; which, indeed, when the true Messias came, proved too, too true, in thy nation.