Mahmud Ahmad wrote Khatam-un-Nabiyyin means Last Prophet
In April 1912 Mirza Bashir-ud-Din Mahmud Ahmad published a writing
entitled Jawab Ishtihar Ghualm Sarwar Kanpuri (Reply
to the Poster by Ghulam Sarwar of Kanpur), relating to the
fulfilment of certain signs of the coming Messiah as reported in
Hadith. This eleven page booklet is available on
the Qadiani Jamaat website alislam.org.
While criticising, quite rightly, those Muslims who ascribe certain
unwarranted attributes to Jesus in his second coming, qualities
which would make him greater than the Holy Prophet Muhammad, Mirza
Mahmud Ahmad writes:
What a pity that Islam has been reduced to the state that
there are Muslims who do not wish the Holy Prophet to have any
distinction. He was the Khatam-un-Nabiyyin, but these Muslims
said: We will not let him be the Khatam-un-Nabiyyin. They
brought back Jesus from heaven after 19 centuries. Now, who is
the Khatam-un-Nabiyyin: the one who comes last or the one
who came earlier? They should have realised that in this way the
distinction of the Holy Prophets finality of prophethood
is removed! Jesus becomes the Khatam-un-Nabiyyin, after
whom there would be no prophet. It would be through his grace
that anyone would find God.
Vol. 1, no. 14, p. 396 in Anwar-ul-Uloom.
He has clearly written here that Khatam-un-Nabiyyin means
the Last Prophet, so whoever comes last must become the Khatam-un-Nabiyyin.
Moreover, there would be no prophet to come after the one who was
Khatam-un-Nabiyyin. This is in plain contradiction with the
later, erroneous doctrine trumpeted by the Qadiani Jamaat
that Khatam-un-Nabiyyin does not mean last but the
best, after whom another prophet can come.
It is to be noted that this writing was published almost four years
after the death of Hazrat Mirza Ghulam Ahmad. It was less than two
years before the Split in the Ahmadiyya Movement, at which point
Mirza Mahmud Ahmad became Khalifa of the Qadiani Jamaat.
What Mirza Mahmud Ahmad has written here in 1912 is, of course,
in agreement with Hazrat Mirza Ghulam Ahmad who wrote that if any
other prophet whatsoever were to come after the Holy Prophet Muhammad
then that prophet would become the Khatam-un-Nabiyyin instead
of the Holy Prophet Muhammad. For his views, please
see this link.