separate the sheep from the goats区别好坏，分清良莠.
《新约 。马太福音》记述：“And before him shall be gathered all nations:and he shall separate them one from another,as a shepherd divideth his sheep from the goats”
由于《圣经》的影响，sheep和goat在英语中的形象截然不同，前者比喻好人，后者比喻坏人 。英语中有关goat的成语，大多贬义 。如：to play the goat=play the fool（瞎胡闹）；to get sb's goat（触动肝火） ；等等 。《圣经》说牧羊人要分辨绵羊和山羊，“把绵羊安置右边，山羊左边” 。据说野山羊常混进羊群里，引诱绵羊，故牧养人必须把它们区分开来，以免混淆 。
由此，人们用to separate the sheep from the goats这个成语，来比喻to separate the good from the wicked; to divide good or useful people from bad or useless
eg:We'll go through the list of members,and separate the sheep from the goats.
Have faith in me,please.I can separate the sheep from the goats
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