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Re:“Out of an abundance of caution” – An overused phrase (2015) by hammock on Saturday March 14, 2020 @11:12PM (#22580906)
Re:“Out of an abundance of caution” – An overused phrase (2015) by judge2020 on Saturday March 14, 2020 @11:34PM (#22581023)
Earliest I found (in terms of books with a year next to them) is from 1689:

https://books.google.com/books?id=4zJWAAAAYAAJ&newbks=1&newb...

Re:“Out of an abundance of caution” – An overused phrase (2015) by richardfontana on Saturday March 14, 2020 @11:58PM (#22581138)
Specifically for "out of an abundance of caution", in Google Books there begin to be usages around 1911, based on a very quick search. As noted by someone else it's a pretty common phrase among American lawyers.