Abu Dawud Book 006, Hadith Number 2181.

Chapter : Not known.

Narated By Imran ibn Husayn : Mutarrif ibn Abdullah reported:Imran ibn Husayn was asked about a person who divorces his wife, and then has intercourse with her, but he does not call any witness to her divorce nor to her restoration. He said: You divorced against the sunnah and took her back against the sunnah. Call someone to bear witness to her divorce, and to her return in marriage, and do not repeat it.