Sahih al-Bukhari 43
Narrated 'Aisha:
Once the Prophet (ﷺ) came while a woman was sitting with me. He said, "Who
     is she?" I replied, "She is so and so," and told him about her 
     (excessive) praying. He said disapprovingly, "Do (good) deeds which is
     within your capacity (without being overtaxed) as Allah does not get 
     tired (of giving rewards) but (surely) you will get tired and the best
     deed (act of Worship) in the sight of Allah is that which is done 
     regularly."
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى، عَنْ هِشَامٍ، قَالَ أَخْبَرَنِي أَبِي، عَنْ عَائِشَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم دَخَلَ عَلَيْهَا وَعِنْدَهَا امْرَأَةٌ قَالَ ‏"‏ مَنْ هَذِهِ ‏"‏‏.‏ قَالَتْ فُلاَنَةُ‏.‏ تَذْكُرُ مِنْ صَلاَتِهَا‏.‏ قَالَ ‏"‏ مَهْ، عَلَيْكُمْ بِمَا تُطِيقُونَ، فَوَاللَّهِ لاَ يَمَلُّ اللَّهُ حَتَّى تَمَلُّوا ‏"‏‏.‏ وَكَانَ أَحَبَّ الدِّينِ إِلَيْهِ مَا دَامَ عَلَيْهِ صَاحِبُهُ‏.‏