'Sift' in the Bible

And Yahweh said to Gideon, "There [are] still too many troops; bring them down to the water, and I will sift through them for you there. For whomever I say to you, 'This [one] will go with you,' he will go with you; and for all whom I say to you, 'This [one] will not go with you,' he will not go."