Bismillah.
Volume 3, Book 27, Number 4:
Narrated Mujahid:
Ursa bin Az Zubair and I entered the Mosque (of the Prophet (sallallaahu `alayhi wasallam)) and saw 'Abdullah bin Umar (radiallaahu `anhu) sitting near the dwelling place of Aisha (radiallaahu `anhaa) 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 (sallallaahu `alayhi wasallam) 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 (radiallaahu `anhaa), 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 (radiallaahu `anhu) is saying?" She said, "What does he say?" 'Ursa said, "He says that Allah's Apostle (sallallaahu `alayhi wasallam) performed four 'Umra and one of them was in the month of Rajab." 'Aisha (radiallaahu `anhaa) said, "May Allah be merciful to Abu 'Abdur Rahman (radiallaahu `anhu)! The Prophet (sallallaahu `alayhi wasallam) did not perform any 'Umra except that he was with him, and he never performed any 'Umra in Rajab."
Volume 3, Book 27, Number 5:
Narrated 'Ursa bin Az-Zubair:
I asked 'Aisha (radiallaahu `anhaa) (whether the Prophet (sallallaahu `alayhi wasallam) had performed 'Umra in Rajab). She replied, "Allah's Apostle (sallallaahu `alayhi wasallam) never performed any 'Umra in Rajab."
Volume 3, Book 27, Number 6:
Narrated Qatada:
I asked Anas (radiallaahu `anhu) how many times the Prophet (sallallaahu `alayhi wasallam) had performed 'Umra. He replied, "Four times. 1. 'Umra 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. 'Umra 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 (radiallaahu `anhu)) replied, "Once. "
Volume 3, Book 27, Number 7:
Narrated Qatada:
I asked Anas (radiallaahu `anhu) (about the Prophet (sallallaahu `alayhi wasallam)'s 'Umra) and he replied, "The Prophet (sallallaahu `alayhi wasallam) performed 'Umra when the pagans made him return, and Umra of al-Hudaibiya (the next year), and another 'Umra in Dhi-l-Qa'da, and another 'Umra in combination with his Hajj."
Volume 3, Book 27, Number 8:
Narrated Hammam:
The Prophet (sallallaahu `alayhi wasallam) performed four 'Umra (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.
Volume 3, Book 27, Number 9:
Narrated Abu Ishaq:
I asked Masruq, 'Ata' and Mujahid (about the 'Umra of Allah's Apostle (sallallaahu `alayhi wasallam)). They said, "Allah's Apostle (sallallaahu `alayhi wasallam) had performed 'Umra in Dhi-l-Qa'da before he performed Hajj." I heard Al-Bara' bin 'Azib (radiallaahu `anhu) saying, "Allah's Apostle (sallallaahu `alayhi wasallam) had performed 'Umra in Dhi-l-Qa'da twice before he performed Hajj."
There's some difference of opinion among the Companions regarding the number of `Umrahs of the Prophet (sallallaahu `alayhi wasallam). But the most authentic and correct view is that he did it four times in his life. And Allah knows best.
Ibn al-Qayyim said:
He did ‘Umrah four times after the Hijrah, four ‘Umrahs, all of them in Dhu’l-Qi’dah.
The first was the ‘Umrah of al-Hudaybiyah, which was the first of them, in 6 AH, but the mushrikeen prevented him from reaching the House (the Ka’bah), so he offered the sacrifice (of camels) when his way was blocked at al-Hudaybiyah, and he and his companions shaved their heads and exited the state of ihraam, and went back in the same year to Madeenah.
The second was the Fulfilled ‘Umrah in the following year, when he entered Makkah and stayed there for three (days), then he left after completing his ‘Umrah.
The third was the ‘Umrah which he did along with his Hajj.
The fourth was his ‘Umrah from al-Ja’raanah, when he went out to Hunayn then he came back to Makkah and performed ‘Umrah from al-Ja’raanah.
He said: there is no (scholarly) dispute concerning the fact that he did no more than four ‘Umrahs.
See Zaad al-Ma’aad, vol. 2, p. 90-93
As for `Umrah in Rajab, there are no reports that describe any virtue of performing `Umrah in the month of Rajab, nor did the Prophet (sallallaahu `alayhi wasallam) do so. Rather, all his `Umrahs were in the month of Dhul-Qa`dah. Read more on it here.
