Sunan Ibn Majah Book 5, Hadith 1371

حَدَّثَنَا عِمْرَانُ بْنُ مُوسَى اللَّيْثِيُّ، حَدَّثَنَا عَبْدُ الْوَارِثِ بْنُ سَعِيدٍ، عَنْ عَبْدِ الْعَزِيزِ بْنِ صُهَيْبٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ دَخَلَ الْمَسْجِدَ فَرَأَى حَبْلاً مَمْدُودًا بَيْنَ سَارِيَتَيْنِ فَقَالَ ‏"‏ مَا هَذَا الْحَبْلُ؟‏ "‏ ‏.‏ قَالُوا لِزَيْنَبَ تُصَلِّي فِيهِ فَإِذَا فَتَرَتْ تَعَلَّقَتْ بِهِ ‏.‏ فَقَالَ ‏"‏ حُلُّوهُ. حُلُّوهُ. لِيُصَلِّ أَحَدُكُمْ نَشَاطَهُ. فَإِذَا فَتَرَ فَلْيَقْعُدْ ‏"‏ ‏.‏

It was narrated from Anas bin Malik that the Messenger of Allah (ﷺ) entered the mosque and saw a rope tied between two pillars. He said, “What is this rope?” They said:“It belongs to Zainab. She prays here and when she gets tired she holds on to it.” He said: “Untie it, untie it; let any one of you pray when he has energy, if he gets tired let him sit down.”