How to reconcile the prohibition of fasting on the days of the disbelievers' festivals with fasting on 'Ashura?

Question : May Allah bless you. How do you reconcile the prohibition of fasting on the days of the disbelievers' festivals with fasting on the tenth and mercy?

Answer : The reconciliation is that the Messenger (peace and blessings be upon him) fasted on 'Ashura and ordered the people to fast it, and he said to the Jews, "We have more right to Moses than you do." Since there is an explicit text established regarding this, it is followed.