Multiple realities(covers information from several alternate timelines)
Arabs were a people that lived on Earth in the Middle East and north of Africa.
Their primary language was Arabic, and they were known for breeding Arabian horses. According to Jean-Luc Picard, "ancient Arabs believed that Allah gathered the south wind and made the horse." (TNG: "Pen Pals")
Spock stated that the saying "The enemy of my enemy is my friend" was an Arab proverb coined by a prince who was later decapitated by a "friend". (Star Trek Into Darkness)
In reality, the origins of the saying are disputed.