Sunan Ibn Majah, Book 33, Hadith 155 (In-Book) ⓘ

It was narrated that Umm Hani' said: "I came to the Messenger of Allah 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.'"

حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ الْحِزَامِيُّ، حَدَّثَنَا أَبُو يَحْيَى، زَكَرِيَّا بْنُ مَنْظُورٍ حَدَّثَنِي مُحَمَّدُ بْنُ عُقْبَةَ بْنِ أَبِي مَالِكٍ، عَنْ أُمِّ هَانِئٍ، قَالَتْ أَتَيْتُ إِلَى رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ 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 ‏" ‏ ‏.‏