[19].Surah Maryam [Mary] : Ayat 37

Ayat 37. Then the sects differed [i.e. the Christians about 'Iesâ (Jesus)], so woe unto the disbelievers [those who gave false witness by saying that 'Iesâ (Jesus) is the son of Allah] from the meeting of a great Day (i.e. the Day of Resurrection, when they will be thrown in the blazing Fire).

[Tafseer] Judgement the word in the original is Mashhad , which implies many things: (1) the time or place where evidence is taken, as in a Court of Judgement; (2) the time or place where people are produced (to be judged); and (3) the occasion for such production for the taking of evidence. A very expressive phrase for the Day of Judgement.  

Hazrat Ibn Abbas (May Allah be pleased with them) reported: The Messenger of Allah [SAWW](PBUH)observed Saum (fasting) on the day of `Ashura' and commanded us to fast on this day. [Al-Bukhari] 

Lesson : Ashura' 10th of Muharram. In another Hadith, it is stated that when the Prophet (PBUH) emigrated from Makkah to Al-Madinah, he saw that the Jews were fasting on this day. He asked them why they did this on that day, and they told him that they did it for the reason that Allah granted Prophet Musa emancipation from Pharaoh on this day, and so they observed Saum in token of their joy. On this, he (PBUH) said that in this happiness of Prophet Musa, Muslims have a greater right to observe Saum than the Jews. Consequently, he also observed Saum on 10th of Muharram. Then, he said that if he lived the following year, he would observe Saum on 9th of Muharram also so that they would make themselves different from the Jews. According to another Hadith, he (PBUH) ordained the Muslims to observe Saum on `Ashura' and in addition one more Saum on 9th or 11th of Muharram in opposition to the Jews.