Al-Kāfi

Hadith 781
oaths-vows
9- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ عَنْ ثَعْلَبَةَ بْنِ مَيْمُونٍ عَنْ مَعْمَرِ بْنِ عُمَرَ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنِ الرَّجُلِ يَقُولُ عَلَيَّ نَذْرٌ وَلَمْ يُسَمِّ شَيْئاً قَالَ لَيْسَ بِشَيْ‏ءٍ.
9. A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from Tha‘labah ibn Maymun from Mu’ammar ibn ‘Umar who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), about the case of a man who says there is a vow on him but does not specify anything. He (the Imam) said, ‘He does not owe anything.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī