The whispers of the Shaytaan have increased in my prayer
The whispers (of Shaytaan) have increased in (my) prayer. Does it invalidate my prayer?
Answer:No, it does not invalidate your prayer. However, it lessens the reward; and the reward of the prayer is not written for you except in that part in which I your heart was present.
Question answered by the Esteemed scholar Shaykh Saalih bin Fawzaan al-Fawzaan.