16. "Our Lord, obliterate their wealth and harden their hearts so that they will not believe until they see the painful punishment." Which Prophet supplicated this dua?

السلام عليكم ورحمة الله وبركاتة       

ﺑِﺴْـــــــﻢِﷲِﺍﻟﺮَّﺣْﻤَﻦِﺍلرَّﺣِﻴﻢ

Answer:

Musa (AS).

Explanation:

Pharaoh exalted himself in the land of Egypt. He oppressed the children of Israel and involved them with all kinds of hard work for mean wages.

As a precaution to prevent the birth of the boy baby who would be responsible for the downfall of his kingdom, Firaun

ordered to kill all the boy babies born to the Children of Isralites. He appointed stern men and female nurses to do this job, who carry out his orders mercilessly.

Inspite of all the precautions, Firaun took to stop the birth of the prophet, Musa (AS) was born and Allah made him to grow in his own palace. 

When Musa (AS) attained his full strength, and was perfect 

in manhood, Allah bestowed on him Prophet hood, right judgment of the affairs and religious knowledge.

Allahuthala commanded him and his brother Harun (AS) to go to Pharaoh  and say: "Verily, we are Messengers of your Lord, so let the children of Israel go with us, and torment them not; indeed, we have come with a sign from your Lord! And peace will be upon him who follows the guidance! Truly, it has been revealed to us that the torment will be for him who denies and turns away." (20:9-48).

But they were too proud, arrogant and unjust toward them. Even after getting signs after signs nine times from Allahuthala, Firaun and his courtiers never believed their religion and never allow others to follow it. They persecuted badly who have believed the Lord of Musa (AS) and Harun (AS). He tortured extremely his own wife because she was a believer. Allah says, "So see how was the end of those people" [7:103]

After dealing with them for a long period patiently,  frustrated Musa (AS) prayed to Allah, "Our Lord, indeed You have given Pharaoh and his establishment splendor and wealth in the worldly life, Our Lord, that they may lead [men] astray from Your way. Our Lord, obliterate their wealth and harden their hearts so that they will not believe until they see the painful punishment." [10:88]

Allah said, "Your supplication has been answered. So remain on a right course and follow not the way of those who do not know." [10:89]

And Allahuthala took the Children of Israel across the sea, and Pharaoh and his soldiers pursued them in tyranny and enmity until, when drowning overtook him and his troop. At that time Firaun said, "I believe that there is no deity except that in whom the Children of Israel believe, and I am of the Muslims." [10:90]

Allahuthala asked him, "Now? And you had disobeyed [Him] before and were of the corrupters?  [10:91].

Allahuthala recorded in Quran, "So today We will save you in body that you may be to those who succeed you as a sign. And indeed, many among the people, of Our signs are heedless. [10:92].

الحمدلله