It is narrated from Muhammad bin Sirin (may Allah have mercy on him) that a nephew of ours (a sister's son) got married and arranged a meal. On that occasion Ibn Sirin (may Allah have mercy on him), (mentioning the asceticism and poverty of the noble Companions,) said: "A man from among the Companions of the Messenger of Allah (peace and blessings be upon him) would pass several days in such a state that he ate nothing. Then, if he found a piece of (dried) leather, he would make do with it, and if he found nothing at all, he would tie a stone to his stomach (to bear the severity of hunger)."
Imam Ahmad bin Hanbal (may Allah have mercy on him) recorded it in Kitab al-Zuhd.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الرقائق / 3164
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :هذا إسناد صحيح، رجاله ثقات. » «أخرجه مصنف ابن أبي شيبة برقم: 36694»