Rajab is the seventh month of the Islamic calendar. The lexical definition of Rajaba is "to respect", which is where the word Rajab has been derived from.

Events during Rajab

• Muhammad is reported to have ascended to heaven on the 27th of Rajab on either Sunday or Monday (Mi'raaj).
• In the year 5 A.H Hadhrat Bilal Ibn Haritha is reported to have brought a congregation of four hundred men named Banu Muzeena in the presence of the Prophet Muhammad. They all embraced Islam.
• The Battle of Tabook took place in the year 9 A.H. This was the last battle which the Muhammad participated in.
• The second Oath of Aqabah took place in Rajab, 12 A.H.

References

Monthly Profiles of the Islamic Calendar(Copyright)