Hadhrat Aamir the son of the Hadhrat Abdullah Bin Zubayr Radhiyallahu Anhu reports from his father that he once approached Rasulullah ﷺ as Rasulullah ﷺ was having his blood being cupped. When the cupping complete, Rasulullah ﷺ, “O Abdullah, take this blood and throw it where nobody sees you”
However, when Hadhrat Abdullah Bin Zubayr Radhiyallahu Anhu left Rasulullah ﷺ, he took the blood and drank it up. (Drinking blood is totally forbidden however this was an exceptional case due to the sole fact that involves Rasulullah ﷺ). After returning, Rasulullah ﷺ asked him what he had done with the blood and he replied, “I have placed it in a most hidden place where I am sure nobody would find it.”
“Did you perhaps drink it” Rasulullah ﷺ enquired.
When he admitted he did, Rasulullah ﷺ said, ” Why did you drink the blood?” Destruction shall come to people from you and destruction shall come to you from people” (Here Rasulullah ﷺ was referring to the strife that took place during the time of Marwaan and Abdul Malik).”
Hadhrat Abu Moosa reports from Hadhrat Abu Aasim that according to popular opinion, the phenomenal strength that Hadhrat Abdullah bin Zubayr Radhiyallahu Anhu came through this blood.
Another narration adds when Rasulullah ﷺ enquired from Hadhrat Abdullah bin Zubayr Radhiyallahu Anhu as to why he did so, Hadhrat Abdullah Bin Zubayr Radhiyallahu Anhu replied, “I wished to have the blood of Allah’s Rasool ﷺ in my belly.”
Rasulullah ﷺ said, “The fire (of Jahannam) shall not touch you except to fulfil the promise (of passing over the Bridge of Siraat that spans Jahannam).”
Source: Hayaatus Sahabah, Vol 2, page 346