What is the authenticity of the Hadith that mentions the Messenger of Allah, peace and blessings be upon him, said: "If a servant says 'SubhanAllah' ten times, 'Alhamdulillah' ten times, and 'Allahu Akbar' ten times in supplication, then Allah says, 'I have done, I have done'"? And what is its wording?

The Hadith narrated from Umm Sulaym (may Allah be pleased with her), that the Prophet (peace be upon him) said to her: "Glorify Allah ten times, praise Him ten times, and magnify Him ten times, then ask for your need, for He will say: 'I have done it, I have done it,'" is weak and defective.

It is replaced by what was narrated from Umm Rafi' (may Allah be pleased with her), that the Prophet (peace be upon him) said: "O Umm Rafi', when you stand for prayer, glorify Allah ten times, say 'La ilaha illallah' ten times, praise Him ten times, magnify Him ten times, and seek His forgiveness ten times." This remembrance is to be said at the beginning of the prayer, after the opening takbeer and before the recitation.

This was indeed authentically reported from Aisha (may Allah be pleased with her) when she was asked: How did the Messenger of Allah (peace be upon him) begin his night prayer? She said: "The Messenger of Allah (peace be upon him) would say 'Allahu Akbar' ten times, praise Allah ten times, glorify Allah ten times, say 'La ilaha illallah' ten times, and seek forgiveness ten times."