Authentic Supplication Number 169.

Allah The Exalted said with respect to the story of the two men: “Why do you not, when you enter into your garded say: Ma sha’a ‘allahu la quwwata ‘illa bil-lahi”. The Prophet  said: “The `Ein (the [evil] eye) is true, and if there was anything that was going to beat Fate, the evil eye would have beaten it.”

Reported by Muslim and Ahmad by way of ‘Ibn `Abbas. Al-Albani included this hadeeth in The Authentic of Good Sayings as #187.