Sahih Bukhari, Volume 6, Book60, Number 184

Narrated Abu Bakr:
The Prophet said, “Time has come back to its original state which it had when Allah created the Heavens and the Earth; the year is twelve months, four of which are sacred. Three of them are in succession; Dhul-Qa’da, Dhul-Hijja and Al-Muharram, and (the fourth being) Rajab Mudar (named after the tribe of Mudar as they used to respect this month) which stands between Jumad (ath-thani)
and Sha’ban.”
Sahih Bukhari, Volume 6, Book60, Number 184

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