Musannaf Ibn Abi Shaybah

Hazrat Humaid al-Tawil says that once it was mentioned before Hasan that the reward for fasting on the Day of Arafah is equal to the reward of fasting for a whole year. Upon hearing this, Hasan said that in my opinion, no day has any superiority over another day. And except for Laylat al-Qadr, no night has any superiority over another night. The Night of Qadr is better than a thousand nights. I saw Hazrat Uthman bin Abi al-As that he used to fast on the Day of Arafah, and due to the intense heat, water would be sprinkled on him for coolness.