مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3429
Oaths and Vows
Vows - Section 1
وَعَن عقبَة بن عَامر عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «كَفَّارَةُ النَّذْرِ كَفَّارَةُ الْيَمِينِ» . رَوَاهُ مُسْلِمٌ
‘Uqba b. ‘Amir reported God’s Messenger as saying, “The atonement for a vow is the same as for an oath.” Muslim transmitted it.
Mishkat al-Masabih, 3429صَحِيح (الألباني)