Ali take the promise from clerk that Whenever he get his daughter's letter , he gave to him if he will be not alive send it to his grave .When he send his lovely Meriam's letter to his grave. This insure that the promise is fullfill.

Promise Extracted by Ali from the Clerk:
Ali extracted a promise from the clerk to deliver a letter to his brother Hassan who was living in the village.

Insuring the Promise is Fulfilled:
To insure that the promise is fulfilled, Ali took the following steps:

1. Paid the Clerk in Advance: Ali paid the clerk in advance for delivering the letter to his brother Hassan. This ensured that the clerk had a financial incentive to fulfill his promise.

2. Gave Detailed Instructions: Ali gave detailed instructions to the clerk about where his brother Hassan lived and how to find him. This minimized the chances of the letter being delivered to the wrong person or location.

3. Asked for a Receipt: Ali asked the clerk for a receipt to prove that he had delivered the letter to his brother Hassan. This ensured that Ali had evidence of the delivery in case there were any issues later on.

4. Followed Up with Brother: After a few days, Ali followed up with his brother Hassan to confirm that he had received the letter. This ensured that the letter had been delivered successfully and that the promise had been fulfilled.

Conclusion:
In conclusion, Ali took several steps to ensure that the promise made by the clerk to deliver the letter to his brother Hassan was fulfilled. By paying in advance, giving detailed instructions, asking for a receipt, and following up with his brother, Ali minimized the risks and ensured that the letter was delivered successfully.