Go into ihram when you see the new moon

This hadith is about the importance of going into a state of ihram during the sighting of a new moon. Ihram is an Arabic term which refers to a sacred state that one enters in order to perform certain religious rituals such as Hajj or Umrah. It involves wearing two pieces of white cloth and abstaining from certain activities such as cutting nails or hair, hunting animals etc. In this hadith, Umar ibn al-Khattab advised people in Makka to go into ihram when they see the new moon as it marks the beginning of a month in Islamic calendar and thus signifies an important time for performing religious rituals. This hadith teaches us that we should be mindful about our appearance and behaviour during special occasions like sighting a new moon so that we can properly observe our religious duties with respect and reverence.