Is this Hadith authentic?
Umm Hani’ bintu Abi Talib (radiyallahu ‘anha) said:
“The Messenger of Allah (sallallahu ‘alayhi wa sallam) walked past me one day so I said, “O Messenger of Allah, I have become old and weak – or something similar to this – tell me of a good deed that I can do while I am sitting.”
He (sallallahu ‘alayhi wa sallam, said: “Say ‘Subhanallah’ one hundred times for it is equivalent to freeing one hundred slaves from the offspring of Isma’il and say ‘Alhamdulillah’ one hundred times for it is equivalent to one hundred horses saddled with reins ready to carry [fighters] in the cause of Allah and say ‘Allahu Akbar’ one hundred times for it is equivalent to one hundred camels [accepted by Allah] and say ‘La Ilaha illallah’ one hundred times.”
Ibn Khalaf [the narrator from ‘Asim] said, “I think he said: “It fills what is between the heavens and the earth, and on that day out of all the deeds that are risen to Allah, none will be better than yours except for a person who said what you said.”