In 1877 Mirza announced that he is going to write a book in 50 volumes, namely 'Braheen Ahmadiyya', to prove the truthfulness of Islam. Mirza announced that whosoever would write a rebuttal of this book would be presented with Rs. 10,000 (a big fortune in 1880s).
Mnamo mwaka 1877 Mirza alitangaza kuwa alikuwa mbioni kuandika kitabu cha juzuu 50 kinachoitwa «Braheen Ahmadiya», kuthibitisha ukweli wa Uislamu. Mirza akatangaza kuwa yeyote ambaye angeaandika majibu ya kitabu hiki angezawadiwa Rupia 10.000 (donge nono la miaka ya 1880).