The borrower travelled by sea and finished his business. Then he looked for a ship to bring him back by the agreed time, and he could not find one. So he took a piece of wood and hollowed it out, put in it a thousand dinars and a letter to the lender, and sealed the place.
He came to the sea and said, in the meaning of his words: O Allah, You know that I borrowed a thousand dinars from so-and-so. He asked me for a guarantor and I said that Allah is sufficient, and he was pleased with You. He asked me for a witness and I said that Allah is sufficient, and he was pleased with You. I tried hard to find a ship to send him his money and I could not, and I entrust it to You.
His dua is plain and honest. He tells Allah the whole matter: what he borrowed, what he promised, what he tried and what he could not do, and then he leaves the rest to Him.
Then he threw the wood into the sea until it went in, and went away. He was still looking for a ship to take him home.