Is the following narration authentic?
A woman once said, O Rasulullah! Inform me of a few words [which I may use for Dhikr] but don’t mention too many. Rasulullah (sallallahu ‘alayhi wa sallam) said:
Say, ‘Allahu Akbar’ ten times, Allah says, ‘This is for me’.
Say, ‘Subhanallah’ ten times, Allah says, ‘This is for me’.
Say ‘Allahummagh Firli’ [O Allah forgive me], Allah says, ‘I have done so’
you repeat the Istighfar ten times, and Allah says, I have done so’.