Abu Hawrah Sa‘di narrates: I asked Hasan ibn Ali (may Allah be pleased with him), “Do you remember anything from the sayings of the Prophet (PBUH)?” He replied, “Once, the Prophet took me to the room where the charity goods were kept. I remember picking up a date from there and putting it in my mouth. The Prophet took it out, along with the saliva, and placed it back with the other dates. A man who witnessed this remarked, ‘What would have happened if he had eaten that one date?’ The Prophet said, ‘We do not consume charity goods.’ Hasan stated that the Prophet used to say, ‘Avoid doubtful matters and adhere to what is undoubtedly permissible, for truth brings tranquility and falsehood only causes unease and agitation.'” (Musnad Ahmad, Hadith No. 1723)
Umm Kulthum bint ‘Uqbah (may Allah be pleased with her) narrates: I heard the Messenger of Allah (PBUH) say, “The one who reconciles between people and speaks good or enhances good words is not a liar.” (Tirmidhi, Hadith No. 1857)
Abdullah ibn Mas‘ud (may Allah be pleased with him) narrates: The Messenger of Allah (PBUH) said, “Adhere to truthfulness, for truthfulness leads to righteousness, and righteousness leads to Paradise. (Remember), a person continues
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to speak the truth until they are recorded as a truthful person (Siddiq) in the sight of Allah. And avoid lying, for lying leads to sinfulness, and sinfulness leads to Hellfire. (Remember), a person continues to lie until they are recorded as a liar (kadhdhab) in the sight of Allah.” (Muslim, Hadith No. 4727)