Hadith #11 (The Forty Hadith of Imam Nawawi)
Book: Leaving that which causes doubt
Narrator(s): Abu Muhammad al-Hasan ibn Ali ibn Abi Talib
Grade: Hasan

I memorised from the Messenger of Allah (peace and blessings of Allah be upon him): “Leave that which makes you doubt for that which does not make you doubt.”

Source: https://parallelquran.com/hadith/forty-nawawi-11/