Sahih Muslim | Book 8 | Hadith Number 3361

Narrated by Ibn 'Abbas
Ibn "Abbas (Allah be pleased with them) reported that Allah's Messenger (may peace be upon him) said: If anyone amongst you intends to go to his wife he should say: In the name of Allah, O Allah protect us against Satan and keep away the Satan from the one that you have bestowed upon us, and if He has ordained a male child for them, Satan will never be able to do any harm to him.