Allah's Messenger (ﷺ) said, "Do not swear by your fathers."
Sahih al-Bukhari Book 83, Hadith 27
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I heard `Umar saying, "Allah's Messenger (ﷺ) said to me, 'Allah forbids you to swear by your fathers." `Umar said, "By Allah! Since I heard that from the Prophet (ﷺ) , I have not taken such an oath, neither intentionally, nor by reporting the oath of someone else."
Sahih al-Bukhari Book 83, Hadith 26 Next Hadith → There was a relation of love and brotherhood between this tribe of Jarm and Al-Ash`ariyin. Once we were with Abu Musa Al-Ash`ari, and then a meal containing chicken was brought to Abu Musa, and there was present, a man from the tribe of Taimillah who was of red complexion as if he were from non-Arab freed slaves. Abu Musa invited him to the meal. He said, "I have seen chickens eating dirty things, so I deemed it filthy and took an oath that I would never eat chicken." On that, Abu Musa said, "Get up, I will narrate to you about that. Once a group of the Ash`ariyin and I went to Allah's Messenger (ﷺ) and asked him to provide us with mounts; he said, 'By Allah, I will never give you any mounts nor do I have anything to mount you on.' Then a few camels of war booty were brought to Allah's Messenger (ﷺ) , and he asked about us, saying, 'Where are the Ash-'ariyin?' He then ordered five nice camels to be given to us, and when we had departed, we said, 'What have we done? Allah's Messenger (ﷺ) had taken the oath not to give us any mounts, and that he had nothing to mount us on, and later he gave us that we might ride? Did we take advantage of the fact that Allah's Messenger (ﷺ) had forgotten his oath? By Allah, we will never succeed.' So we went back to him and said to him, 'We came to you to give us mounts, and you took an oath that you would not give us any mounts and that you had nothing to mount us on.' On that he said, 'I did not provide you with mounts, but Allah did. By Allah, if I take an oath to do something, and then find something else better than it, I do that which is better and make expiation for the dissolution of the oath.' "
Sahih al-Bukhari Book 83, Hadith 28
Sahih al-Bukhari Book 83, Hadith 26 Next Hadith → There was a relation of love and brotherhood between this tribe of Jarm and Al-Ash`ariyin. Once we were with Abu Musa Al-Ash`ari, and then a meal containing chicken was brought to Abu Musa, and there was present, a man from the tribe of Taimillah who was of red complexion as if he were from non-Arab freed slaves. Abu Musa invited him to the meal. He said, "I have seen chickens eating dirty things, so I deemed it filthy and took an oath that I would never eat chicken." On that, Abu Musa said, "Get up, I will narrate to you about that. Once a group of the Ash`ariyin and I went to Allah's Messenger (ﷺ) and asked him to provide us with mounts; he said, 'By Allah, I will never give you any mounts nor do I have anything to mount you on.' Then a few camels of war booty were brought to Allah's Messenger (ﷺ) , and he asked about us, saying, 'Where are the Ash-'ariyin?' He then ordered five nice camels to be given to us, and when we had departed, we said, 'What have we done? Allah's Messenger (ﷺ) had taken the oath not to give us any mounts, and that he had nothing to mount us on, and later he gave us that we might ride? Did we take advantage of the fact that Allah's Messenger (ﷺ) had forgotten his oath? By Allah, we will never succeed.' So we went back to him and said to him, 'We came to you to give us mounts, and you took an oath that you would not give us any mounts and that you had nothing to mount us on.' On that he said, 'I did not provide you with mounts, but Allah did. By Allah, if I take an oath to do something, and then find something else better than it, I do that which is better and make expiation for the dissolution of the oath.' "
Sahih al-Bukhari Book 83, Hadith 28