Jami` at-Tirmidhi 1092
جامع الترمذي#1092SahihIbn Abbas narrated that:The Messenger of Allah said: "If anyone of you, when having sexual intercourse with his wife, says: (Bismillah, Allahumma jannibnash-Shaitana wa jannibish-Shaitana ma razaqtana) 'In the Name of Allah, O Allah! Protect me from Shaitan and protect what you bestow upon us from Shaitan' - then if Allah decrees that they should have a child, Shaitan will not be able to harm him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 11:13