The Prophet ﷺ used to observe many acts of worship and obedience regularly, one of which was fasting on the Day of ‘Aashooraa’. He ﷺ observed fasting on that day to express gratitude to Allah, Exalted is He, for rescuing his brother Moosaa (Moses) fromPharaoh. In this hadeeth, ‘Abdullah ibn ‘Abbaas (may Allah be pleased with them) related that he did not see the Prophet ﷺ intently and keenly seeking to fast on a day except the Day of ‘Aashooraa’, favoring it over other days of the year and singling it out for fasting. It was narrated on the authority of Ibn ‘Abbaas (may Allah be pleased with them), as cited in Saheeh Muslim, that the act of Sunnah in this regard is to fast on the ninth day of Muharram along with the Day of ‘Aashooraa’, to act contrary to the Jews. Moreover, it has also been authentically reported in Saheeh Muslim on the authority of Aboo Qataadah (may Allah be pleased with him) that fasting on the Day of ‘Aashooraa’ expiates the sins committed during the previous year. This implies that the Day of ‘Aashooraa’ is the best day to observe fasting, Ramadan aside. However, Ibn ‘Abbaas (may Allah be pleased with them) attributed that conclusion to his own knowledge and opinion, and his statement does not refute the other narrations reported by other Companions (may Allah be pleased with them) in this regard. For instance, a Marfoo‘ hadeeth (i.e., directly attributed to the Prophet ﷺ) was reported in Saheeh Muslim on the authority of Aboo Qataadah (may Allah be pleased with him) stating that fasting on the Day of ‘Aashooraa’ atones for the sins committed during the previous year, and that fasting on the day of ‘Arafah expiates the sins committed during two years: the previous and following ones. The apparent indication of the hadeeths is that fasting on the day of ‘Arafah is better (i.e., more virtuous and rewardable) than fasting the Day of ‘Aashooraa’. It has been said that the wisdom behind this is that the Day of ‘Aashooraa’ is attributed to Prophet Moosaa, while the day of ‘Arafah is attributed to the Prophet ﷺ, and therefore fasting it is deemed better (i.e., more virtuous and rewardable). Likewise, the Prophet ﷺ was keen to fast the month of Ramadan, because it is obligatory, and due to the great bounties bestowed upon the fasting people during that blessed month, including: the divine mercy, deliverance from Hellfire, forgiveness of sins, and the Night of Al-Qadr, which is better and superior to one thousand months (i.e., equivalent to 83 years and 4 months). In fact, Ibn ‘Abbaas (may Allah be pleased with them) made mention of the Day of ‘Aashooraa’ and Ramadan in his statement, even though fasting in the first is optional and in the second is obligatory, because the common feature here is the abundant reward. The meaning of “seeking,” is that he ﷺ intended to fast it, aspiring to obtain its reward..