Musnad Ahmad 2173

It was narrated that Ibn 'Abbas said: The Messenger of Allah (ﷺ) said: "Is one of you incapable of saying, when he comes to his wife, ‘In the Name of Allah, O Allah, keep the Shaitan away from me and keep the Shaitan away from what You may bless me with? Then if Allah decrees that they should have a child as a result of that, the Shaitan will never harm him.”