“The time to buy is when there's blood in the streets, even if the blood is your own.”
A statement sometimes attributed to him, and also, more plausibly, to the first Baron Rothschild (as one of 1871); as quoted in Heads I Win, Tails I Win: Why Smart Investors Fail and How to Tilt the Odds in Your Favour (2016) by Spencer Jakab, p. 221
Variants:
When there's blood in the streets it's time to buy.
As quoted in Inside Man (2006)
Disputed