IBNHIBBAN 1321:
from Ābtighāʾ al-ʿIlm —
[Machine] "What brings you here?" I said, "Seeking knowledge." He said, "Indeed, the angels spread their wings for the seeker of knowledge, pleased with what he seeks." I said, "May I ask you - an action that I perform in private, which is wiping over my socks after using the toilet - I used to be one of the companions of the Prophet Muhammad ﷺ , so I came to you to ask if you have heard from him anything about it?" He said, "Yes, he used to instruct us when we were traveling or on a journey, not to remove our socks for three days and nights unless due to Janabah (major ritual impurity), but to remove them for using the toilet, urine, and sleep.”
ابن حبّان ١٣٢١:
عن ابتغاء العلم —
مَا جَاءَ بِكَ؟ قُلْتُ ابْتِغَاءَ الْعِلْمِ قَالَ فَإِنَّ الْمَلَائِكَةَ تَضَعُ أَجْنِحَتَهَا لِطَالِبِ الْعِلْمِ رِضًا لِمَا يَطْلُبُ قُلْتُ حَكَّ فِي نَفْسِي الْمَسْحُ عَلَى الْخُفَّيْنِ بَعْدَ الْغَائِطِ وَالْبَوْلِ وَكُنْتَ امْرَأً مِنْ أَصْحَابِ النَّبِيِّ ﷺ فَأَتَيْتُكَ أَسْأَلُكَ هَلْ سَمِعْتَ مِنْهُ فِي ذَلِكَ شَيْئًا؟ قَالَ نَعَمْ «كَانَ يَأْمُرُنَا إِذَا كُنَّا سَفْرًا أَوْ مُسَافِرِينَ أَنْ لَا نَنْزِعَ خِفَافَنَا ثَلَاثَةَ أَيَّامٍ وَلَيَالِيَهُنَّ إِلَّا مِنْ جَنَابَةٍ لَكِنْ مِنْ غَائِطٍ وَبَوْلٍ وَنَوْمٍ»
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