Ziyad bin Jubair says that Sayyiduna Abdullah bin Umar (may Allah be pleased with him) was walking in Mina when a man asked him a question, saying: I have made a vow to fast every Tuesday or Wednesday, but now this day is coming on the day of Eid al-Adha. What is your opinion about this? He (may Allah be pleased with him) said: Allah Almighty has commanded the fulfillment of vows, but the Messenger of Allah (peace and blessings be upon him) has forbidden us from fasting on the day of Eid al-Adha. The man thought that perhaps he had not heard his question, so he repeated: I have made a vow to fast every Tuesday or Wednesday, but this time this day is coming on the day of Eid al-Adha. Sayyiduna Abdullah bin Umar (may Allah be pleased with him) said: Allah Almighty has commanded the fulfillment of vows, and the Messenger of Allah (peace and blessings be upon him) has forbidden us from fasting on the day of Eid al-Adha. He did not say anything more than this until he climbed the mountain.