Al-Hasan ibn Ali, the grandson of the Messenger of Allah, peace be upon him, reported: I memorized from the Messenger of Allah his saying:
دَعْ مَا يَرِيبُكَ إِلَى مَا لَا يَرِيبُكَ فَإِنَّ الصِّدْقَ طُمَأْنِينَةٌ وَإِنَّ الْكَذِبَ رِيبَةٌ
“Leave that about which you are in doubt for that about which you are in no doubt.”
[Al-Tiramidhi and Al-Nasaii]
This hadith helps Muslims distinguish and forsake what is false (that which leads to doubt) from what is true (something we know to be correct, which brings a sense of peace and tranquility).