The Prophet (ﷺ) said, "Truthfulness leads to righteousness, and righteousness leads to Paradise. And a man keeps on telling the truth until he becomes a truthful person. Falsehood leads to Al-Fajur (i.e. wickedness, evil-doing), and Al-Fajur (wickedness) leads to the (Hell) Fire, and a man may keep on telling lies till he is written before Allah, a liar."
Sahih al-Bukhari Book 78, Hadith 121
← Previous Hadith A man came to the Prophet (ﷺ) on a Friday while he (the Prophet) was delivering a sermon at Medina, and said, "There is lack of rain, so please invoke your Lord to bless us with the rain." The Prophet (ﷺ) looked at the sky when no cloud could be detected. Then he invoked Allah for rain. Clouds started gathering together and it rained till the Medina valleys started flowing with water. It continued raining till the next Friday. Then that man (or some other man) stood up while the Prophet (ﷺ) was delivering the Friday sermon, and said, "We are drowned; Please invoke your Lord to withhold it (rain) from us" The Prophet smiled and said twice or thrice, "O Allah! Please let it rain round about us and not upon us." The clouds started dispersing over Medina to the right and to the left, and it rained round about Medina and not upon Medina. Allah showed them (the people) the miracle of His Prophet and His response to his invocation.

Sahih al-Bukhari Book 78, Hadith 120 Next Hadith → Allah's Messenger (ﷺ) said, "The signs of a hypocrite are three: Whenever he speaks, he tells a lie; and whenever he promises, he breaks his promise; and whenever he is entrusted, he betrays (proves to be dishonest)".

Sahih al-Bukhari Book 78, Hadith 122