No one specific color is ''sacred'', however the color most often associated with Muslims is green, because the Ottomans, who used it in their flag, were primarily Muslim.
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Very sacred to them
It is the city of Jerusalem. It is sacred city for Muslims, Christians, and Jews.
the city of Jerusalem.
dik, their considered sacred
The Kaaba is the most sacred spot on earth for Muslims. The Kaaba is located in Mecca (or Makkah), in the Kingdom of Saudi Arabia. It is the most sacred city for Muslims for having Al-Masjid Al-Haram (or the Grand Mosque) that surrounds the Kaaba.
If by the Sacred Mosque you mean the Great Mosque in Mecca, yes it is.
Muslims don't worship any building. Even, the Kaaba (that is the most sacred Islamic building) is not worshiped by Muslims but respected and honored by Muslims. If you wish to read about places where Muslims worship (both houses of worship and sacred sites) read the Related Question below.
Arabic in which the holy Qur'an is written
the kabbah
The most sacred text of the Muslims is the holy Qur'an, that is the word of Almighty Allah revealed to the last Prophet of Islam (SAW).The collections of the sayings of the holy Prophet (SAW) are also sacred books of the Muslims.