Sahih Muslim , Hadith 784 ⓘ
Anas reported that the Messenger of Allah entered the mosque (and he found) a rope tied between the two pillars; so he said: What is this? They said: It is for Zainab. She prays and when she slackens or feels tired she holds it. Upon this he (the Holy Prophet) said: Untie it. Let one pray as long as one feels fresh but when one slackens or becomes tired one must stop it. (And in the hadith transmitted by Zuhair it is:" He should sit down." )
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ عُلَيَّةَ، ح وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا إِسْمَاعِيلُ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسٍ، قَالَ دَخَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْمَسْجِدَ وَحَبْلٌ مَمْدُودٌ بَيْنَ سَارِيَتَيْنِ فَقَالَ " مَا هَذَا " . قَالُوا لِزَيْنَبَ تُصَلِّي فَإِذَا كَسِلَتْ أَوْ فَتَرَتْ أَمْسَكَتْ بِهِ . فَقَالَ " حُلُّوهُ لِيُصَلِّ أَحَدُكُمْ نَشَاطَهُ فَإِذَا كَسِلَ أَوْ فَتَرَ قَعَدَ " . وَفِي حَدِيثِ زُهَيْرٍ " فَلْيَقْعُدْ " .
also referenced under: Book 6, Hadith 259 (In-Book) & Book 4, Hadith 1714 (USC-MSA)
A hadith like this has been narrated from the Messenger of Allah on the authority of Anas by another chain of transmitters.
وَحَدَّثَنَاهُ شَيْبَانُ بْنُ فَرُّوخَ، حَدَّثَنَا عَبْدُ الْوَارِثِ، عَنْ عَبْدِ الْعَزِيزِ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم مِثْلَهُ .
also referenced under: Book 6, Hadith 260 (In-Book) & Book 4, Hadith 1715 (USC-MSA)