Salam Brother
It is often claimed that the blessed Rasool was sent as Rehmat-lil-Aalameen.
Is this title in the Qur'an or based on secondary sources?
Thanks.
Salamun Alaikum.
The reference is Quranic, but it is usually quoted out of context with a view to assert a particular theological stance with respect to the Prophet. Please see the following article which I trust will address the matter, God willing.
PROPHET MUHAMMAD (pbuh) AS A MERCY TO CREATION
http://quransmessage.com/articles/prophet%20muhammad%20as%20a%20mercy%20to%20creation%20FM3.htm
Regards,
Joseph.