The Holy Prophet (Peace Be Upon Him) said that if people knew the benefits of reciting this Surah, they would leave their work in order to learn it.
If a person recites this Surah at night, then ALLAH sends angels to protect the reciter and his faith is also secure. The angels seek forgiveness for him. The reward for reciting this Surah is equal to all those things on this Earth upon which the sun shines.
Writing and drinking water of this Surah is beneficial for cure of ailments. Surah al-Bayyinah is also good for pregnant women and helps to ensure their safety and the safety of their babies. Reciting this Surah before eating food removes any ill effects of the foods.