From the first outbreak of the crisis in the southern city of Deraa to apocalyptic forecasts of a Middle East soaked in blood, many combatants on both sides of the conflict say its path was set 1,400 years ago in the sayings of the Prophet Mohammad and his followers.
Among those many thousands of sayings, or hadith, are accounts which refer to the confrontation of two huge Islamic armies in Syria, a great battle near Damascus, and intervention from the north and west of the country.
The power of those prophecies for many fighters on the ground means that the three-year-old conflict is more deeply rooted - and far tougher to resolve - than a simple power struggle between President Bashar al-Assad and his rebel foes.
Syria's war has killed more than 140,000 people, driven millions from their homes and left many more dependent on aid. Diplomatic efforts, focused on the political rather than religious factors driving the conflict, have made no headway.
"If you think all these mujahideen came from across the world to fight Assad, you're mistaken," said a Sunni Muslim jihadi who uses the name Abu Omar and fights in one of the many anti-Assad Islamist brigades in Aleppo.
"They are all here as promised by the Prophet. This is the war he promised - it is the Grand Battle," he told Reuters, using a word which can also be translated as slaughter.
On the other side, many Shi'ites from Lebanon, Iraq and Iran are drawn to the war because they believe it paves the way for the return of Imam Mahdi - a descendent of the Prophet who vanished 1,000 years ago and who will re-emerge at a time of war to establish global Islamic rule before the end of the world.
According to Shi'ite tradition, an early sign of his return came with the 1979 Iranian revolution, which set up an Islamic state to provide fighters for an army led by the Mahdi to wage war in Syria after sweeping through the Middle East.
"This Islamic Revolution, based on the narratives that we have received from the prophet and imams, is the prelude to the appearance of the Mahdi," Iranian cleric and parliamentarian Ruhollah Hosseinian said last year.
He cited comments by an eighth century Shi'ite imam who said another sign of the Mahdi's return would be a battle involving warriors fighting under a yellow banner - the color associated with Lebanon's pro-Assad Hezbollah militia.
"As Imam Sadeq has stated, when the (forces) with yellow flags fight anti-Shi'ites in Damascus and Iranian forces join them, this is a prelude and a sign of the coming of his holiness," Hosseinian was quoted as saying by Fars news agency.Read the whole thing.