Narrated Anas:

The Messenger of Allah ﷺ entered the mosque (and saw that) a rope tied between two pillars. He asked: What is this rope (for) ? The people told him: This is (for) Hamnah b. Jahsh who prays (here). When she is tired, she reclines on it. The Messenger of Allah ﷺ said: She should pray as much as she has strength. When she is tired, she should sit down.

This version of Ziyad has: He said: What is this ? The people told him: This is for Zainab who prays. When she becomes lazy, or is tired, she holds it. He said: Undo it. One of you should pray in good spirits. When he is lazy or tired, he should sit down.

حَدَّثَنَا زِيَادُ بْنُ أَيُّوبَ، وَهَارُونُ بْنُ عَبَّادٍ الأَزْدِيُّ، أَنَّ إِسْمَاعِيلَ بْنَ إِبْرَاهِيمَ، حَدَّثَهُمْ حَدَّثَنَا عَبْدُ الْعَزِيزِ، عَنْ أَنَسٍ، قَالَ دَخَلَ رَسُولُ اللَّهِ ﷺ الْمَسْجِدَ وَحَبْلٌ مَمْدُودٌ بَيْنَ سَارِيَتَيْنِ فَقَالَ " مَا هَذَا الْحَبْلُ " . فَقِيلَ يَا رَسُولَ اللَّهِ هَذِهِ حَمْنَةُ بِنْتُ جَحْشٍ تُصَلِّي فَإِذَا أَعْيَتْ تَعَلَّقَتْ بِهِ . فَقَالَ رَسُولُ اللَّهِ ﷺ " لِتُصَلِّ مَا أَطَاقَتْ فَإِذَا أَعْيَتْ فَلْتَجْلِسْ " . قَالَ زِيَادٌ فَقَالَ " مَا هَذَا " . فَقَالُوا لِزَيْنَبَ تُصَلِّي فَإِذَا كَسِلَتْ أَوْ فَتَرَتْ أَمْسَكَتْ بِهِ . فَقَالَ " حُلُّوهُ " . فَقَالَ " لِيُصَلِّ أَحَدُكُمْ نَشَاطَهُ فَإِذَا كَسِلَ أَوْ فَتَرَ فَلْيَقْعُدْ " .