Don't count your chickens before they hatch!

1 Kings 20:9-12 (KJV)
⁹  Wherefore he said unto the messengers of Benhadad, Tell my lord the king, All that thou didst send for to thy servant at the first I will do: but this thing I may not do. And the messengers departed, and brought him word again.
¹⁰  And Benhadad sent unto him, and said, The gods do so unto me, and more also, if the dust of Samaria shall suffice for handfuls for all the people that follow me.
¹¹  And the king of Israel answered and said, Tell him, Let not him that girdeth on his harness boast himself as he that putteth it off.
¹²  And it came to pass, when Benhadad heard this message, as he was drinking, he and the kings in the pavilions, that he said unto his servants, Set yourselves in array. And they set themselves in array against the city.