A popular proverb is:
   
“Give a man a fish and he will eat for a day. Teach a man to fish and he will eat for a lifetime.”
 
A version of this involves the Nigerian advance-fee scam:
 
“Give a Nigerian a fish and he will eat for a day. Teach a Nigerian to phish and he becomes a prince.”
 
“Give a man a fish, feed him for a day.  Teach a Nigerian to phish, feed my Inbox for the rest of his life” was posted on Twitter by Rhett Maxwell on December 21, 2009. “Give a man a fish, and he eats for a day. Teach a Nigerian to phish and he’ll become a prince” was posted on Twitter by “why?” on April 21, 2014.
   
     
Wikipedia: Phishing
Phishing is the attempt to obtain sensitive information such as usernames, passwords, and credit card details (and money), often for malicious reasons, by disguising as a trustworthy entity in an electronic communication. The word is a neologism created as a homophone of fishing due to the similarity of using a bait in an attempt to catch a victim. According to the 2013 Microsoft Computing Safety Index, released in February 2014, the annual worldwide impact of phishing could be as high as US$5 billion.
           
Twitter 
rhett maxwell
@rhettmaxwell
Give a man a fish, feed him for a day.  Teach a Nigerian to phish, feed my Inbox for the rest of his life.
1:31 PM - 21 Dec 2009
     
Twitter
J R Paul Hunt
@jrphunt
Replying to @lyndons
@lyndons give a hungry man a fish and he will eat for a day, teach a Nigerian to phish and we all get Viagra spam forever
6:23 AM - 27 Mar 2011
 
Twitter
Mr. Savage
@Thin_Diesel
Give a Nigerian a fish and he will eat for a day…..Teach a Nigerian to phish and he will steal your identity.
11:38 AM - 6 Jun 2011
 
Twitter
why?
@knot_eye
Follow Follow @knot_eye
Give a man a fish, and he eats for a day. Teach a Nigerian to phish and he’ll become a prince.
2:50 PM - 21 Apr 2014
 
Reddit—Jokes   
Give a man a fish, and he eats for a day
submitted July 20, 2016 by FarazR90
Teach a Nigerian to phish and he’ll become a prince.
 
Reddit—Jokes
Give a man a fish, and he eats for a day…
submitted December 9, 2016 by PM_ME_YOUR_OMFG
Teach a Nigerian to phish and he’ll become a prince.
 
Reddit—Jokes
Teach a Nigerian to fish…
submitted December 21, 2016 by Sdavis2911
He’ll eat for a day. Teach a Nigerian to phish and he’ll become a prince and start emailing people.
   
Reddit—Jokes
Teach a man to fish, and he’ll be able to eat for a lifetime
submitted January 2, 2017 by TheBasinator
Teach a Nigerian to phish, and he’ll become a prince.
   
Twitter
Bob Kostic
@causticbob
Give a Nigerian a fish he’ll eat for a day.
Teach a Nigerian to phish and he’ll become a prince and start e-mailing people.
6:35 AM - 17 Sep 2017
 
Reddit—Jokes
Nigerian Fishing
submitted October 12, 2017 by _Bradleh
Give a Nigerian a fish and he’ll eat for the day.
Teach a Nigerian to phish, and he’ll immediately turn into a prince and start emailing people.
 
Reddit—Jokes
Give a Nigerian a fish and he will eat for a day.
submitted March 21, 2018 by LittEleven
Teach a Nigerian to phish and he becomes a prince.