Sahih Bukhari

Narrated Wahb bin Kaisan:Jabir bin `Abdullah said, ""We set out, and we were three-hundred men carrying our journey-food on our shoulders. Then we began to eat a single date each per day."" A man asked (Jabir), ""O Abu `Abdullah! How could a person be satisfied with a single date?"" Jabir replied, ""We realized the value of that one date when we could not even have that much till we reached the sea-shore, when all of a sudden we saw a huge fish cast by the sea. So, we ate of it as much as we wished for eighteen days