‘A’ishah radiAllahu anha narrated:
[Once, when I saw the Prophet in a good mood, I said to him: “O Messenger of Allah! Supplicate to Allah for me!”
So, he said: “O Allah! Forgive ‘A’ishah her past and future sins, what she has hidden, as well as what she has made apparent.”
So, I began smiling, to the point that my head fell into the lap of the Messenger of Allah (salAllahu alayhi wa sallam) out of joy.
The Messenger of Allah said to me: “Does my supplication make you happy?” I replied: “And how can your supplication not make me happy?”
He then said: “By Allah, it is the supplication that I make for my Ummah in every prayer.”]
[Reported in ‘Sahih Mawarid adh-Dhaman’ (1875), and it is in 'as-Silsilah as-Sahihah’ (2254)]