Sahih Muslim
The Book of Marriage (Kitab Al-Nikah)
Book Number: 008 / Hadith Number: 3449
Abu Qilaba reported on the authority of Anas: It is the Sunnph to stay with a virgin (after having married her) for a week. Khalid (one of the narrators) said: If wish I can say that it can be traced up to the Holy Prophet (may peace be upon him).