Abdullah said:

I was sitting with my father, may Allah have mercy on him, one day, and he looked at my feet and they were soft and had no cracks, so he said to me: What are these feet; why don’t you walk barefoot so that your feet becomes rougher [1].

Reference:

[1] Tareekh Madeenat Dimashq (92/298)

قال عبد الله: كنت جالسا عند أبي رحمه الله يوما, فنظر إلى رجلي وهما لينتان, ليس فيهما شقاق, فقال لي: ما هذه الرجلان, لم لا تمشي حافيا حتى تصير رجلاك خشنتين.ـ

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