Shofetim 7:4

And HASHEM said unto Gid'on, HaAm are yet too many; bring them down unto the mayim, and I will sift them for thee there; and it shall be, that of whom I say unto thee, This shall go with thee, the same shall go with thee; and of whomsoever I say unto thee, This shall not go with thee, the same shall not go.