Narrated Abu Huraira: Allah's Apostle said, "(The performance of) 'Umrah is an expiation for the sins committed (between it and the previous one). And the reward of Hajj Mabrur (the one accepted by Allah) is nothing except Paradise."   Narrated Ibn Juraij: Ikrima bin Khalid asked Ibn 'Umar about performing 'Umrah before Hajj. Ibn 'Umar replied, "There is no harm in it." 'Ikrima said, "Ibn 'Umar also said, 'The Prophet had performed 'Umrah before performing Hajj.'"  Narrated 'Ikrima bin Khalid: "I asked Ibn 'Umar the same (as above)."

Narrated Mujahid: Ursa bin AzZubair and I entered the Mosque (of the Prophet) and saw 'Abdullah bin Umar sitting near the dwelling place of Aisha and some people were offering the Duha prayer. We asked him about their prayer and he replied that it was a heresy. He (Ursa) then asked him how many times the Prophet had performed 'Umra. He replied, 'Four times; one of them was in the month of Rajab." We disliked to contradict him. Then we heard 'Aisha, the Mother of faithful believers cleaning her teeth with Siwak in the dwelling place. 'Ursa said, "O Mother! O Mother of the believers! Don't you hear what Abu 'Abdur Rahman is saying?" She said, "What does he say?" 'Ursa said, "He says that Allah's Apostle performed four 'Umra and one of them was in the month of Rajab." 'Aisha said, "May Allah be merciful to Abu 'Abdur Rahman! The Prophet did not perform any 'Umrah except that he was with him, and he never performed any 'Umrah in Rajab."  
Narrated 'Ursa bin Az-Zubair: I asked 'Aisha (whether the Prophet had performed 'Umra in Rajab). She replied, "Allah's Apostle never performed any 'Umrah in Rajab." 

 
Narrated Qatada: I asked Anas how many times the Prophet had performed Umrah. He replied, "Four times. 1. Umrah of Hudaibiya in Dhi-l-Qa'da when the pagans hindered him; 2. 'Umra in the following year in Dhi-l-Qa'da after the peace treaty with them (the pagans); 3. Umrah from Al-Jr'rana where he distributed the war booty." I think he meant the booty (of the battle) of Hunain. I asked, "How many times did he perform Hajj?" He (Anas) replied, "Once. "  
Narrated Qatada: I asked Anas (about the Prophet's Umrah) and he replied, "The Prophet performed Umrah when the pagans made him return, and Umrah of al-Hudaibiya (the next year), and another Umrah in Dhi-l-Qa'da, and another 'Umrah in combination with his Hajj."  
Narrated Hammam: The Prophet performed four Umrah (three) in Dhi-l-Qa'da except the (one) 'Umra which he performed with his Hajj: His 'Umra from Al-hudaibiya, and the one of the following year, and the one from Al-Jr'rana where he distributed the booty (of the battle) of Hunain, and another 'Umra with his Hajj.
Narrated Abu Ishaq: I asked Masruq, 'Ata' and Mujahid (about the Umrah of Allah's Apostle). They said, "Allah's Apostle had performed Umrah in Dhi-l-Qa'da before he performed Hajj." I heard Al-Bara' bin 'Azib saying, "Allah's Apostle had performed 'Umrah in Dhi-l-Qa'da twice before he performed Hajj."  

Narrated Ata: I heard Ibn 'Abbas saying, "Allah's Apostle asked an Ansari woman (Ibn 'Abbas named her but 'Ata' forgot her name), 'What prevented you from performing Hajj with us?' She replied, 'We have a camel and the father of so-and-so and his son (i.e. her husband and her son) rode it and left one camel for us to use for irrigation.' He said (to her), 'Perform Umrah when Ramadan comes, for Umrah in Ramadan is equal to Hajj (in reward),' or said something similar." 
Click Here to read the Hajj and Umrah latest news