It is considered absolutely unforgivable for an Assassin to kill (or as they refer to it, "inhume") for any reason other than being paid
Kaynak: Ankh-Morpork Assassins' Guild

Xingjiao Temple was built in AD 669 to re-inhume Xuanzang and was one of eight famed temples in Fanchuan in Tang Dynasty . Although the
Kaynak: Xingjiao Temple