It was narrated from Ibn 'Abbas (رضي الله عنه) that the Prophet (ﷺ) said:

"If one of you - or, if one of them - says, when he has intercourse with his wife, ‘In the Name of Allah, O Allah keep the Shaitan away from me and keep the Shaitan away from what You bestow on us (our children),' if a child is born to them, the Shaitan will never have power over him - or the Shaitan will never be able to harm him."