Yahweh said to Gideon, The people are yet too many; bring them down to the water, and I will try them for you there: and it shall be, that of whom I tell you, This shall go with you, the same shall go with you; and of whoever I tell you, This shall not go with you, the same shall not go.
In the law Moses had said that the Israelites should not force the fearful to go into battle (Deuteronomy 20:8). God reminded Gideon to give any who were afraid the opportunity to go home, which he did (Judges 7:3). However the large number that deserted him, more than two out of three, must have shocked Gideon. Then God said that even the remaining 10,000 soldiers (or 10 units) were too many (Judges 7:4).