The Prophet (ﷺ) said, "If anyone of you, on having sexual relation with his wife, says: 'O Allah! Protect me from Satan, and prevent Satan from approaching the offspring you are going to give me,' and if it happens that the lady conceives a child, Satan will neither harm it nor be given power over it."
Reference: Sahih al-Bukhari 3283 In-book : Book 59, Hadith 92 USC-MSA web (English) : Vol. 4, Book 54, Hadith 503 (deprecated)
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