Barahin-e-Ahmadiyya Volume 1 and 2

Barahin-e-Ahmadiyya Parts I and II were authored by Hadrat Mirza Ghulam Ahmad(as) of Qadian and published in 1880. At that time the Indian subcontinent had become a virtual battleground for the major religions of the world. Islam, in particular, found itself on the defensive against the onslaughts of Christians and Hindus, who spared no ploy to defame the Faith and its Founder(sa).
Hadrat Mirza Ghulam Ahmad(as), pained by these unjust attacks, undertook a series of debates and discourses with Christians and Hindus. Establishing faith in Tauhid (Oneness of God)—which he found only in Islam—was his primary concern. He writes: What I am trying to demonstrate by writing all this is that Tauhid, in its purest form, is not to be found among any people on the face of the earth except the followers of the Holy Prophet, may peace and blessings of Allah be upon him. And there is no book upon the earth, other than the Holy Quran, that has firmly committed millions to this holy doctrine and that leads mankind so reverentially towards the One True God. People of every religion have created artificial gods for themselves, whereas the God of the Muslims is the One, Eternal, and Immutable God, whose attributes are the same today as they were before. (see Part II, Preface, on page 138)
At last, as a conclusive argument against the detractors of Islam, he decided to write Barahin-e-Ahmadiyya—a compendium of arguments for the truth of the Holy Quran and Islam. He announced a reward of 10,000 rupees—the sum total of his considerable wealth at the time—for anyone who could counter even a fraction of these arguments or produce similar arguments from their own scriptures—a challenge that remains uncontested to this day.