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In the morning, greet someone with "Sabaḥu Al-khair. Respond to a morning greeting with "Sabaḥu An-Nur. In the afternoon or evening, greet someone with "Masa’u Al-khair. Respond to an afternoon or evening greeting with "Al-khair An-Nur.

Article:
" This is the Arabic equivalent of the English “good morning.”  The most direct translation available for this Arabic phrase is "good morning," and is generally only used to greet someone before noon or so. In Arabic script, this greeting is written from right to left as: صباح الخير Pronounce this greeting as sah-bah-heu ahl-kha-ir. " If someone greeted you with “Sabaḥu Al-khair” first, this is the proper way to say “hello” back.  In practical terms, this phrase essentially means “good morning, too.” More directly, though, the greeting translates to something along the lines of “morning light.” In Arabic script, this greeting is written from right to left as: صباح النور You should pronounce this greeting as sah-bah-heu ahn-nuhr. ” This is the Arabic equivalent of the English “good day.”  This phrase can be used to say “good afternoon” or “good evening.” You should use it any time after noon passes during a given day.  In Arabic script, this greeting is written from right to left as: مساء الخير Pronounce this phrase as mah-sah-uh ahl-kha-ir. " If someone greets you with “ Masa’u Al-khair” first, this is the correct way to say “hello” back.  In practical terms, this phrase essentially means “good evening, too,” but more directly, the greeting translates into something along the lines of “evening light.” In Arabic script, this greeting is written from right to left as: مساء النور This phrase should be pronounced as ahl-kha-ir ahn-nuhr.