Repeating 'Umrah and Designating Rajab for It

Question:
If a Muslim performs 'Umrah and then wants to go to Makkah again after a week, does he perform another 'Umrah, or is the first 'Umrah sufficient for him? And what is the validity of the claim that 'Umrah in Rajab is superior?

Answer:
If he performs 'Umrah and then goes to Makkah after a week, he has a choice: if he wishes, he enters the state of ihram for a second 'Umrah, and if he wishes, he enters without ihram. However, performing a second 'Umrah is better, because 'Umrah is a righteous deed. It is an opportunity that has arisen for him due to his trip to Makkah, and performing 'Umrah again is better for him. Otherwise, it is not obligatory upon him.
As for 'Umrah in Rajab specifically, no evidence has been established for it. Singling out the month of Rajab for worship, whether fasting or prayer—what they call the Prayer of al-Raghā'ib—or a Rajab 'Umrah, none of this has any evidence. Rajab is like the other months, except that it is one of the four sacred months. However, no evidence has been established for singling it out for any specific act of worship. The Prophet (peace and blessings be upon him) performed all his 'Umrahs in the months of Hajj, specifically in the month of Dhul-Qa'dah, except for the 'Umrah of al-Ja'ranah, which was in Shawwal. That was when he returned from the expedition against the Hawazin, the expedition to Ta'if. He entered the state of ihram from al-Ja'ranah, intending to enter Makkah, may peace and blessings be upon him. As for the 'Umrah of al-Hudaybiyyah and the rest, they were all in Dhul-Qa'dah, and he never performed 'Umrah in Rajab.