'Aishah (May Allah be pleased with her) said:
I asked the Messenger of Allah (ﷺ) about random looks in Salat (prayer), and he replied, "It is something which Satan snatches from the slave's Salat."[Al-Bukhari]. (ID)
App reference (ID): Book 18, Hadith 245 (ID)
Arabic/English book reference (ID): Book 18, Hadith 1755 (ID)