Annotation:
This sentence can be found (with different punctuation) in the Toki Pona Proverbs section in the official Toki Pona book (Toki Pona: The Language of Good by Sonja Lang, 2014)
Translations given in the book:
[#2195627] If you give evil, you will receive evil.
- What negativity you send out will return to you.
List of all official Toki Pona proverbs:
http://tatoeba.org/eng/sentences_lists/show/7042