Al-Kāfi
Hadith 1495- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ أَبِيهِ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنْ مُفَضَّلِ بْنِ عُمَرَ قَالَ قَالَ أَبُو عَبْدِ اللهِ (عَلَيْهِ السَّلام) لا يَنْبَغِي لِلْمُؤْمِنِ أَنْ يُذِلَّ نَفْسَهُ قُلْتُ بِمَا يُذِلُّ نَفْسَهُ قَالَ يَدْخُلُ فِيمَا يَتَعَذَّرُ مِنْهُ.
5. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from his father from Muhammad ibn Sinan from Mufaddal ibn ‘Umar who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘A believer must not humiliate himself.’ I then asked, ‘In what way can he humiliate himself?’ He (the Imam) replied, ‘He can do so by involving himself in things that he cannot do.’”