Hadithcore
Riyad as-Salihin, 55

Hasan bin 'Ali (May Allah be pleased with them) said:

I remember (these words) from Messenger of Allah (ﷺ): "Give up what is doubtful to you for that which is not doubtful; for truth is peace of mind and falsehood is doubt". <b>[At- Tirmidhi, who categorised it as Hadith Hasan Sahih]</b>.

الثانى‏:‏ عن أبي محمد الحسن بن علي بن أبي طالب، رضي الله عنهما ، قال ‏:‏ حفظت من رسول الله، صلى الله عليه وسلم ‏:‏ ‏

‏دع ما يريبك إلى ما لا يريبك؛ فإن الصدق طمأنينة، والكذب ريبةٌ‏

‏ ‏(‏‏(‏رواه الترمذي وقال حديث حسن صحيح‏)‏‏)‏ ‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 55
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) The individual must abandon lying and commit to the truth, because lying plants doubt whereas the truth inspires tranquility.<br> 2) A manifestation of one’s piety is to avoid the doubtful and ambiguous matters.