Allah-Upanishad or Allopanishad is a Sanskrit apocryphal text with many Arabic words generally argued and believed to be written in India in 16th century during the reign of the Mughal emperor Akbar.
[4] Jogendra Nath Bhattacharya and B. K. Sarkar categorize Allopanishad as an Islamic Work and write that it was written by a converted Muslim courtier of Akbar, as an apocryphal chapter of the Atharvaveda.
Swami Vivekananda said, "I have been told that Allopanishad was written during the reign of Akbar, to bring the Hindus and Mahommedans together, and sometimes they got hold of some word, as Allah, or Illa in the Samhitas, and made an Upanishad on it.
[4] Bhattacharya and Sarkar categorize Allopanishad as an Islamic Work and write that it was written by a converted Muslim courtier of Akbar who had, as an apocryphal chapter of the Atharvaveda.
[9] Abraham Eraly states that the book was symbolic of the various cross-cultural pollination between Hindu and Muslim cultures during the time of the Mughals and was meant to bring the two communities together.