Once Umar (ra) heard a group of men and women talking about a certain lady. Wanting to investigate the matter, he thus summoned for her. This muslimah was pregnant and on hearing this she was so terrified that she was going to go meet the Khalifah that she miscarried on the way and Umar had to pay the blood money. Another time, Umar was getting his hair cut when suddenly he coughed and because of this the barber cut himself in fear. In another narration, it is said the barber urinated on himself.
The other Sahabah got to know about these incidents and Uthman bin Affan, Ali bin Abi Talib, Abdur Rahman ibn Awf, Az-Zubayr bin Awwam (ra) and others gathered to discuss this issue about the immense fear of Umar (ra) in the hearts of the believers. They planned that they would choose from themselves a person to speak to Umar (ra) about it and the boldest of them was Abdur Rahman ibn Awf (ra). He went to Umar (ra) and told him how much the believers feared him. Umar (ra) responded, “Tell me the truth, did the others call you to speak to me?” He replied in the affirmative. He continued, “Oh Abdur Rahman, In the name of Allah I try to be so soft to the point I feel Allah will punish me for that softness, until I become so harsh that I think Allah will punish me for that harshness . O Abdur Rahman, tell me what to do? I don’t know what will happen of me when I meet Allah! I’m trying my best.” Hearing this, Abdur Rahman (ra) started weeping and he left saying, “Woe to them after you, Woe to them after you, what will happen to you O Ummah of Muhammad when Umar will leave.”
~ Indeed if there were to be a prophet after me, it would have been Umar – Prophet Muhammad (pbuh)