The supplication on going in to one's wife

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Messenger of Allah (peace and blessings be upon him) said: "When any one of you intends to have intercourse with his wife, let him recite this supplication: 'I do this in the name of Allah. O Allah, protect us from Satan, and protect from Satan the offspring You give us.' Then if a child is decreed for him from this act, Satan will never be able to harm it."

Abu Sa'id, the freedman of Abu Usayd, said: I married while I was a slave. So I invited a group of the Companions of the Prophet (peace and blessings be upon him), among whom were Sayyiduna Ibn Mas'ud, Sayyiduna Abu Dharr, Sayyiduna Hudhayfah (may Allah be pleased with them) and others. They taught me the etiquette and said: "When your wife comes to you, pray two rak'ahs, and ask Allah for the good of her coming to you, then seek refuge with Allah from her evil. Then it is up to you and your wife."

Alqamah said that when Sayyiduna Ibn Mas'ud (may Allah be pleased with him) had intercourse with his wife, he would recite this supplication after ejaculation: "O Allah, do not give Satan any share in the offspring You give us."