"I came to the Messenger of Allah ﷺ and said: 'O Messenger of Allah, tell me of a (good) deed, for I have become old and weak and overweight.' He said: 'Proclaim the greatness of Allah (say Allahu Akbar) one hundred times, praise Allah (say Al-Hamdu Lillah) one hundred times, and glorify Allah (say Subhan-Allah) one hundred times. (That is) better than one hundred horses bridled and saddled for the sake of Allah, better than one hundred sacrificial camels, and better than (freeing) one hundred slaves.'"  

أَتَيْتُ إِلَى رَسُولِ اللَّهِ ﷺ فَقُلْتُ يَا رَسُولَ اللَّهِ دُلَّنِي عَلَى عَمَلٍ فَإِنِّي قَدْ كَبِرْتُ وَضَعُفْتُ وَبَدَّنْتُ فَقَالَ كَبِّرِي اللَّهَ مِائَةَ مَرَّةٍ وَاحْمَدِي اللَّهَ مِائَةَ مَرَّةٍ وَسَبِّحِي اللَّهَ مِائَةَ مَرَّةٍ خَيْرٌ مِنْ مِائَةِ فَرَسٍ مُلْجَمٍ مُسْرَجٍ فِي سَبِيلِ اللَّهِ وَخَيْرٌ مِنْ مِائَةِ بَدَنَةٍ وَخَيْرٌ مِنْ مِائَةِ رَقَبَةٍ  

[Machine] I said, "O Prophet of Allah, I am a woman who has become old and weak, so guide me towards a deed." He said, "Glorify Allah one hundred times, praise Allah one hundred times, and exalt Allah one hundred times. It is better for you than offering one hundred acceptable sacrifices, better than riding one hundred well-trained horses for the sake of Allah, and better than freeing one hundred slaves whose freedom is accepted. Saying 'there is no god but Allah' does not leave any sin or action similar to it."  

قُلْتُ يَا نَبِيَّ اللَّهِ إِنِّي امْرَأَةٌ قَدْ كَبِرْتُ وَضَعُفْتُ فَدُلَّنِي عَلَى عَمَلٍ قَالَ «كَبِّرِي اللَّهَ مِائَةَ مَرَّةٍ وَاحْمَدِي اللَّهَ مِائَةَ مَرَّةٍ وَسَبِّحِي اللَّهَ مِائَةَ مَرَّةٍ فَهُوَ خَيْرٌ لَكِ مِنْ مِائَةِ بَدَنَةٍ مُتَقَبَّلَةٍ وَخَيْرٌ مِنْ مِائَةِ فَرَسٍ مُسْرَجٍ مُلْجَمٍ فِي سَبِيلِ اللَّهِ وَخَيْرٌ مِنْ مِائَةِ رَقَبَةٍ مُتَقَبَّلَةٍ وَقَوْلُ لَا إِلَهَ إِلَّا اللَّهُ لَا يَتْرُكُ ذَنْبًا وَلَا يُشْبِهُهَا عَمَلٌ»  

"مَنْ قَال: سُبْحَانَ الله وَبِحَمْدِهِ، كَانَ مِثْلَ مِائَةِ رَقَبَةٍ تُعْتَقُ إِذَا قَالهَا مِائَةَ مَرَّةٍ، وَمَنْ قَال: الحَمْدُ لله مِائَةَ مَرَّةٍ، كَانَ عِدْلَ مِائةِ فَرَسٍ تُسْرَجُ في سَبِيلِ الله، وَمَنْ قَال: الله أَكْبَرُ مِائَةَ مَرَّةٍ، كَانَ عِدْلَ مِائَةِ بَدَنَةِ تُنْحَرُ بِمَكَّةَ".