It is narrated from Saeed that Sayyiduna Abdullah bin Umar (may Allah be pleased with him) went to Sayyiduna Abdullah bin Zubair (may Allah be pleased with him) and said: O Ibn Zubair! Beware of causing corruption and bloodshed within the sanctuary of Allah. I heard the Messenger of Allah (peace and blessings be upon him) say: Soon, a man from the Quraysh will cause bloodshed in this sanctuary; he will be so sinful that if his sins are compared to the sins of all humans and jinn, his sins will outweigh theirs. Behold, make sure that it is not you.