[Machine] The Messenger of Allah ﷺ once passed by me and I said, "O Messenger of Allah, I have become old, so tell me of a deed that I can do while sitting." He said, "Say Subhan Allah (Glory be to Allah) one hundred times, for it is equivalent to freeing one hundred slaves from the descendants of Isma'il. Say Alhamdulillah (All praise be to Allah) one hundred times, for it is equivalent to increasing one hundred fast horses carrying warriors. Say Allahu Akbar (Allah is the greatest) one hundred times, for it is equivalent to performing one hundred accepted Hajj. Say La ilaha illallah (There is no deity but Allah) one hundred times, for it fills the space between the heavens and the earth, and no deed can surpass it except for the one who does the same."
مَرَّ بِي رَسُولُ اللهِ ﷺ ذَاتَ يَوْمٍ فَقُلْتُ يَا رَسُولَ اللهِ إِنِّي قَدْ كَبِرْتُ فَمُرْنِي بِعَمَلٍ أَعْمَلُهُ وَأَنَا جَالِسَةٌ فَقَالَ «سَبِّحِي اللهَ مِائَةَ تَسْبِيحَةٍ فَإِنَّهَا تَعْدِلُ مِائَةَ رَقَبَةٍ مِنْ وَلَدِ إِسْمَاعِيلَ وَاحْمَدِي اللهَ مِائَةَ تَحْمِيدَةٍ فَإِنَّهَا تَعْدِلُ مِائَةَ فَرَسٍ مُسْرَجَةٍ مُلْجَمَةٍ تَحْمِلِينَ عَلَيْهَا فِي سَبِيلِ اللهِ وَكَبِّرِي اللهَ مِائَةَ تَكْبِيرَةٍ فَإِنَّهَا تَعْدِلُ مِائَةَ بَدَنَةٍ مُتَقَبَّلَةٍ وَهَلِّلِي اللهَ مِائَةَ تَهْلِيلَةٍ فَإِنَّهَا تَمْلَأُ مَا بَيْنَ السَّمَاءِ وَالْأَرْضِ وَلَا يُرْفَعُ لِأَحَدٍ عَمِلٌ أَفْضَلُ مِنْهَا إِلَّا أَنْ يَأْتِيَ بِمِثْلِ مَا أَتَيْتِ»