What is "minan-ur-rahman"

'''Arabic - the Mother of all Languages - (Book) ''' Minan-ur-Rahman [Arabic: منن الرّحمٰن ] is a brief treatise on Philology by Mirza Ghulam Ahmad, (1835-1908) written in May 1895. Ahmad claimed that Arabic was the first language taught to man by God Himself and the Mother of all languages (Arabic: Ummul-al-Sinnah). He highlighted certain peculiarities of the Arabic language, which he claimed could not be found in any other language and challenged his adversaries, to refute his claim also addressing Max Muller (1823-1900) to come forward and meet the challenge.