"...My Lord! Cause me to land at a blessed landing-place, for You are Best of all who bring to land." (Surah Al-Mu'minuun: Ayat 29)
TO BE SAFE FROM DOUBT (WAS-WAS)
Whomsoever wants to protect oneself from doubts instigated by Shaytaan and would like to obtain that Solat which is full of Khushu' (concentration) and Khudu' (devotion) should recite the above Ayat as much as is possible.