I Samuel 14:7-10

So his armorbearer said to him, “Do all that is in your heart. Go then; here I am with you, according to your heart.” Then Jonathan said, “Very well, let us cross over to these men, and we will show ourselves to them. If they say thus to us, ‘Wait until we come to you,’ then we will stand still in our place and not go up to them. But if they say thus, ‘Come up to us,’ then we will go up. For the LORD has delivered them into our hand, and this will be a sign to us.”