I read in a book that there is a supplication recited in prostration after "Subhan Rabbi al-A'la," which is "O Allah, forgive me my sin, my ignorance, and my extravagance in my affairs." Is this...

The questioner : The questioner, Mu'ayyid al-Mutayri, says in his second question: I read in a book that there is a supplication recited in prostration after "Subhan Rabbi al-A'la", which is "O Allah, forgive me my sin, my ignorance, and my extravagance in my affairs". Is this supplication authentic?

The Shaykh : This supplication is authentic, but the idea that it is only for prostration is incorrect. It is said in prostration and in other states. It is established that the Prophet (peace and blessings be upon him) said and that he said , meaning it is likely that your supplications will be answered, because a servant is closest to his Lord when he is in prostration. So when you glorify Allah, if you say "Subhan Rabbi al-A'la" once, you have fulfilled the obligatory minimum, and the lower limit of perfection is three times. If you increase it to ten, that is good. And if you say with it "Subhanak Allahumma Rabbana wa bihamdika, Allahumma ighfir li", that is good, because the Prophet (peace and blessings be upon him) used to frequently say it in his prostration and in his bowing as well. And if you add to that "Subbuhun Quddusun Rabb al-Mala'ikah wa al-Ruh", that is good, because the Prophet (peace and blessings be upon him) used to say that in his bowing and prostration. Then supplicate to Allah the Exalted with whatever you wish from matters of religion and matters of the worldly life, even matters of the worldly life. You may supplicate to Allah with them in your prayer, because supplication itself is an act of worship, whether you supplicate with a matter related to the worldly life or a matter related to the Hereafter, as long as it is not a sin. So supplicate to Allah the Exalted with whatever you wish in your prayer and outside of your prayer.
As for the statement of some scholars that one should not supplicate in his prayer with matters specific to the worldly life, that is a weak statement, because supplication itself is an act of worship, and there is no relation to the matter being supplicated for unless it is a sin. If a person supplicates with a sin, it is forbidden for him and will not be answered. Yes.