Narrated Anas bin Malik Once the Prophet ﷺ entered the Mosque and saw a rope hanging in between its two pillars. He said, "What is this rope?" The people said, "This rope is for Zainab who, when she feels tired, holds it (to keep standing for the prayer.)" The Prophet ﷺ said, "Don't use it. Remove the rope. You should pray as long as you feel active, and when you get tired, sit down."  

دَخَلَ النَّبِيُّ ﷺ فَإِذَا حَبْلٌ مَمْدُودٌ بَيْنَ السَّارِيَتَيْنِ فَقَالَ مَا هَذَا الْحَبْلُ قَالُوا هَذَا حَبْلٌ لِزَيْنَبَ فَإِذَا فَتَرَتْ تَعَلَّقَتْ فَقَالَ النَّبِيُّ ﷺ لاَ حُلُّوهُ لِيُصَلِّ أَحَدُكُمْ نَشَاطَهُ فَإِذَا فَتَرَ فَلْيَقْعُدْ  

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."  

أَنَّ النَّبِيَّ ﷺ 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  

Messenger of Allah ﷺ said, "If anyone of you feels drowsy while praying he should go to bed (sleep) till his slumber is over because in praying while drowsy one does not know whether one is asking for forgiveness or for a bad thing for oneself."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا نَعَسَ أَحَدُكُمْ وَهُوَ يُصَلِّي فَلْيَرْقُدْ حَتَّى يَذْهَبَ عَنْهُ النَّوْمُ فَإِنَّ أَحَدَكُمْ إِذَا صَلَّى وَهُوَ نَاعِسٌ لاَ يَدْرِي لَعَلَّهُ يَسْتَغْفِرُ فَيَسُبَّ نَفْسَهُ