The compound expression "the light of Allah" has been mentioned only in the verses 32 of At-Taubah and 8 of As-Saff. This paper intends to analyze the concept of the light of Allah focusing on the 8 of  As-Saff. Interpretation of the light of Allah indicates an important issue that God has stated that despite of malice and disdain of enemies He will finish it. The light of Allah has been cited by Imams during different times. Grammatically viewed, adding light to Allah is for modification and the light of Allah is of a general concept, applicable to limitless external cases; therefore, regarding its meaning and interpretation, commentators have stated concepts such as faith, Islam, religion, Quran, miracles, esteem and dignity of the prophet, guardianship and Imamate of the Imams.