"He was going to recite the famous Marathi poem 'Pasayadan'...Written in the 13th century by Sant Dnyaneshwar," a source said.
"After finishing his commentary on the Bhagwad ita, Sant Dnyaneshwar wrote Pasayadan as a prayer," he said.
The fire engulfed the stage at a cultural event held at Girgaum Chowpatty seafront here last night.
A string of film celebrities and political leaders were present as part of the high-profile 'Make in India' investment meet but there were no casualties.
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Aamir had earlier attended a dinner hosted by Prime Minister Narendra Modi here on Saturday night.
The "Ghajini" star had kicked up a controversy last year by saying he has been "alarmed" by a number of incidents and his wife Kiran Rao even suggested that they should probably leave India.
His comments evoked sharp criticism from ruling BJP and also the NDA government. Later, the 50-year-old actor's contract as brand ambassador for the government's Incredible India campaign was not renewed by the Tourism Ministry.