不足为信bù zú wéi xìn

hardly worth to be believed/……至汉明帝始立胡神，然惟西域桑门，自传其教。实乃夷犯中国，～。(《西游记》154) It was not until the period of Ming Ti in the Han dynasty that the worship of foreign gods was established,but this meant only that priests of the Western Territory were permitted to propagate their faith. The event,in fact,represented a foreign intrusion in China,and the teachings are hardly worthy to be believed.

不足为信bùzú-wéixìn

见“不足为凭”。《西游记》12回：“实乃夷犯中国，～。”