As per Aisha (may God be pleased with her) said: When I saw that the prophet in a good mood. I said: O Allah’s Messenger, pray for me. He said: O Allah! Forgive ‘A’ishah her past and future sins, what she has hidden, as well as what she has made apparent.” She laughed until her head fell in her lap, the Prophet (PBUH) said: (Does my supplication make you happy?) She said: And how I won’t be happy with your prayer for me? So he said (PBUH): 'By Allah, it is the supplication that I make for my Ummah in every prayer.’
The corrected series for Al Albani (2254).
Which means that our mother Aisha (may God be pleased with her), was very happy and pleased with the Prophet prayers for her, until her head fell in her lap from laughter. So the Prophet made this Annunciation to his entire nation that he used to make this supplication for his nation in each prayer.