Assalāmu ‘alaykum wa rahmatullāhi Wabarakath,
This is just a small reminder to fast tomorrow, the 10th of Muharram insha'Allah.
One of the reasons why Muslims fast this day is because this is the day Moses [Musa] Alayshisalam was victorious over Pharoah.
The fast of the day of 'Aashooraa. (tenth day of Muharram) is recommended, as its excellence has been mentioned in (a number of) ahaadeeth. From them, is the saying of the Prophet (saws): "Certainly the fast of the day of 'Aashooraa. is regarded by Allaah as an expiation for the sins of the previous year".
Also, when the Prophet (saws) arrived in Madeenah he saw the Jews fasting (on this day), so when he asked them (about this), they said: "Certainly, this is the day when Allaah made Moosaa victorious and destroyed Fir'own". So the Prophet (saws) said: We have more of a right to Moosaa than you". So he fasted (that day) and ordered it to be fasted.
It is a Sunnah - and recommended to fast a day with it. Either a day before [The 9th] or the day after [The 11th].
As for the ninth, then it has not been confirmed that the Prophet (saws) fasted it, however, it has been narrated by Ibn 'Abbaass and others that the explanation (tafseer) of the day of 'Aashooraa. is that it is the ninth. And it has been narrated that he (saws) said: "If I am (still) here next year, then certainly I will fast the ninth (day of Muharram)" and in (another) narration: "along with the tenth (day of Muharram)". And he (saws) said: "Differ from the Jews; fast the day before it (the ninth) or the day after it (the eleventh)".
Don't forget to make a lot of Dua for Gaza if you are fasting inshaAllah. For the dua [supplication] of the fasting person is never rejected by Allah.
PS - The reason why my commenting system was not working before because I was trying the option of 'Comment form embed' in blogger - and I forgot to switch it off. Apparently, it doesn't appear on my blog.