What is the difference between the negatives ~ぬ and ~ず, e.g.

。。。飲まず  
。。。飲まぬ

Thanks
CC BY-SA 3.0
2017-06-04T06:56:49.000
48020
2017-06-04T07:01:22.223
2017-06-04T07:01:22.223
9831
9908
question
auxiliary-ず negation
Difference ~ぬ and ~ず