separate the sheep from the goats

to choose the people or things of high quality from a group of mixed quality I'll look through the application forms and separate the sheep from the goats.

Distinguish between good and bad individuals, or superior and inferior ones. For example, In a civil war where both sides commit atrocities, you can't separate the sheep from the goats . This term refers to Jesus's prophecy in the New Testament (Matthew 25:32) that the sheep (that is, the compassionate) will sit on God's right hand (and find salvation), and the goats (the hard-hearted) will sit on the left (and be sent to damnation).