1؎ : The mention of the expiation (kaffarah) for oaths is in this verse of Surah al-Ma'idah «لا يؤاخذكم الله باللغو في أيمانكم ولكن يؤاخذكم بما عقدتم الأيمان فكفارته إطعام عشرة مساكين من أوسط ما تطعمون أهليكم أو كسوتهم أو تحرير رقبة فمن لم يجد فصيام ثلاثة أيام ذلك كفارة أيمانكم إذا حلفتم واحفظوا أيمانكم كذلك يبين الله لكم آياته لعلكم تشكرون»: "Allah does not call you to account for what is unintentional in your oaths, but He calls you to account for what you have sworn solemnly. The expiation for it is feeding ten needy people with the average of what you feed your own families, or clothing them, or freeing a slave, and whoever does not have the means, then fasting for three days. That is the expiation for your oaths when you have sworn, and guard your oaths! Thus Allah makes clear to you His commandments so that you may be grateful." (Surah al-Ma'idah: 89)
Explanation & Benefits
Hafiz Muhammad Ameen
The expiation (kaffarah) for an oath is explicitly mentioned in the Noble Qur’an, and it is: feeding ten needy people, or clothing them, or freeing a slave. If one is unable to do any of these three, then he must fast for three days. And this is also the expiation for a vow (nadhar). In expiation, sequence is not necessary; rather, whichever act is easier may be performed. If the vow is for a righteous deed and one has the ability to fulfill it, then the vow itself must be fulfilled. Expiation is only in the case when fulfilling the vow is not possible, or if the vow is for a sinful act.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 3863
´Narrated 'Uqbah bin 'Amir:` That the Messenger of Allah (ﷺ) said: "The atonement of a vow when it is not specified is the atonement of an oath."
Shaykh Dr. Abdur Rahman Freywai
Explanation: 1: That is, whoever made a vow (nadhar) and did not specify it by name, meaning he only said that if his wish is fulfilled, a vow is due upon him, then its expiation (kaffarah) is the same as the expiation for an oath (yamin).
Note: (However, the phrase 'lam yusamm' is not authentic, and apart from the author, it is not found with anyone else (whereas Abu Dawood, taking this into consideration, has titled a chapter “Whoever makes a vow and does not specify it”). This is an addition from the author’s narrator “Muhammad Mawla al-Mughira,” who himself is an unknown (majhool) narrator; he is not present in the chains of others.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 1528