I said to al-Ḥasan b. ʿAlī: What did you memorize from the Messenger of Allah ﷺ? He said: I memorized from him: "Leave what makes you doubt for what does not make you doubt. The truth brings tranquility while falsehood sows doubt." (Using translation from Tirmidhī 2518)
قُلْتُ لِلْحَسَنِ بْنِ عَلِيٍّ مَا تَذْكُرُ مِنَ النَّبِيِّ ﷺ؟ قَالَ كَانَ يَقُولُ دَعْ مَا يَرِيبُكَ إِلَى مَا لَا يَرِيبُكَ فَإِنَّ الصِّدْقَ طُمَأْنِينَةٌ وَإِنَّ الْكَذِبَ رِيبَةٌ