Due to the literal meaning Forqan is described as criterion or standard. Proof or evidence is the meaning that Wehr’s dictionary give to this word. Uri Rubin introduced Forquan as one of names of the Quran. The root of this word means “separate”. In the Tarikh al-Tabari and Tafsir al-Kabir (al-Razi) the root of this word that means “God’s separating or distinguishing between truth and falsehood, defined as f-r-q”.