Al-Kāfi
Hadith 86318- مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنِ السِّنْدِيِّ بْنِ مُحَمَّدٍ عَنْ صَفْوَانَ الْجَمَّالِ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ قُلْتُ لَهُ بِأَبِي أَنْتَ وَأُمِّي إِنِّي جَعَلْتُ عَلَى نَفْسِي مَشْياً إِلَى بَيْتِ اللهِ قَالَ كَفِّرْ يَمِينَكَ فَإِنَّمَا جَعَلْتَ عَلَى نَفْسِكَ يَمِيناً وَمَا جَعَلْتَهُ للهِ فَفِ بِهِ.
18. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Sindiy ibn Muhammad from Safwan al-Jammal who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), saying, ‘I pray to Allah to keep my soul in service for your cause, I have made a vow and commitment to walk to the House of Allah. He (the Imam) said, ‘You must pay expiation for your oath, because you have made it on yourself and you have not made for Allah; you must then fulfill.’”