Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
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السيوطي:٨٥-٢٧b

"عَنْ أنس قَالَ: دخلَ رَسُولُ الله ﷺ ذاتَ يوم فإذَا حبل ممدود فقالَ: ما هَذَا؟ قِيلَ: فُلاَنة تُصَلى يارسولَ اللهِ ﷺ فإذا أعيت السيْرَ على هذا الحبل. قال: فلتصل ما نشطت فإذا أعيت فلتنم".  

[ش] ابن أبى شيبة

See similar narrations below:

Collected by Ibn Ḥibbān

ذِكْرُ الزَّجْرِ عَنْ صَلَاةِ الْمَرْءِ النَّافِلَةَ إِذَا غَلَبَتْهُ عَيْنَاهُ مَخَافَةَ أَنْ يَقُولَ مَا لَا يَعْلَمُ

ibnhibban:2493Abū Yaʿlá > Abū Khaythamah > Yazīd b. Hārūn > Ḥumayd > Anas

[Machine] The Messenger of Allah (may peace be upon him) entered the mosque and saw a rope stretched between two pillars, so he asked "What is this?". They said, "It is for so-and-so woman who prays, and when she gets tired, she holds on to it." The Messenger of Allah (may peace be upon him) said, "Let her make her prayer as long as she is focused and attentive. But if she fears that she might be overwhelmed, then let her shorten it."  

ابن حبّان:٢٤٩٣حَدَّثَنَا أَبُو يَعْلَى قَالَ حَدَّثَنَا أَبُو خَيْثَمَةَ قَالَ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ قَالَ أَخْبَرَنَا حُمَيْدٌ عَنْ أَنَسٍ

أَنَّ رَسُولَ اللَّهِ ﷺ دَخَلَ الْمَسْجِدَ فَرَأَى حَبْلًا مَمْدُودًا بَيْنَ سَارِيَتَيْنِ فَقَالَ «مَا هَذَا؟ » قَالُوا فُلَانَةٌ تُصَلِّي فَإِذَا أَعْيَتْ تَعَلَّقَتْ بِهِ فَقَالَ رَسُولُ اللَّهِ ﷺ «لِتُصَلِّ مَا عَقَلَتْ فَإِذَا خَشِيَتْ أَنْ تُغْلَبَ فَلْتَنَمْ»