Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Indeed, time is running in the same way as it was on the day Allah Almighty created the heavens and the earth." He said: "'Indeed, the number of months with Allah Almighty is twelve months, as ordained in the Book of Allah; of them, four are sacred.'" The Prophet (peace and blessings be upon him) said: (or the narrator said:) "Three months are consecutive, and one is Rajab of Mudar, which comes between Jumada al-Thani and Sha'ban."
Imam al-Bazzar recorded it; its chain contains Ash'ath bin Sawwar, who is da'if (weak), though he has also been declared thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحج / 5624