"If the Persians see you on the battlefield they will say...
"If the Persians see you on the battlefield they will say: 'This is the source of the danger. If you destroy him you will triumph.' Their war will be more intensive and their hope in defeating the Muslims will grow higher. "As to what you mentioned of the Persian march to fight the Muslims God the Almighty hates their march more than you do and He is more capable of changing what He dislikes. As to what you have mentioned of their great number we never fought by quantity.
We fought only by the help of God and His assistance."[^3] ‘Umar and ‘Ali's Knowledge ‘Umar was deeply impressed with ‘Ali's profound knowledge. It is reported that he said: "No one should give any verdict at the Mosque (of the Prophet) when ‘Ali is present." When he made wrong decisions in Islamic rules ‘Ali used to correct him.
He repeatedly said: "Had ‘Ali not been present ‘Umar would have perished (spiritually)."[^4] He expressed his serious need to ‘Ali's knowledge by saying: "May God not keep me to a problem when Abu Hassan (‘Ali) is not available.". A lady was accused of adultery because she gave birth to a child six months after she married. ‘Umar decided to stone her.
‘Ali said to him: "Leader of the Believers if she appeals to the Book of God contesting your decision she will prevail against you." God says: "Pregnancy and nursing periods are thirty months." Again He says: "Mothers nurse their children two complete years for whoever wants a complete nursing." If we subtract twenty four months from thirty the balance would be six months. ‘Umar reversed his position and let the lady go free. ‘Ali at one time was with ‘Umar while others were present.
When he left one of them criticized ‘Ali and accused him of pride and conceit. ‘Umar said: "A man like ‘Ali is entitled to be proud. By God without his sword the pillar of Islam could not have been erected. He is the highest magistrate in the nation its earliest Muslim and its most honorable."[^5] When the critic asked what prevented him from giving him the leadership after the death of the Prophet ‘Umar replied: "We did not like his young age and his love to his clan.".
However this does not mean that ‘Umar used to consult ‘Ali in all affairs or follow all his opinions in religion. ‘Umar was extremely independent. Sometimes he appeared as if he were in disagreement with the Prophet.