Sahih al-Bukhari Book 78, Hadith 63
The Prophet (ﷺ) was the best among the people (both in shape and
character) and was the most generous of them, and was the bravest of
them. Once, during the night, the people of Medina got afraid (of a
sound). So the people went towards that sound, but the Prophet (ﷺ) having
gone to that sound before them, met them while he was saying, "Don't
be afraid, don't be afraid." (At that time) he was riding a horse
belonging to Abu Talha and it was naked without a saddle, and he was
carrying a sword slung at his neck. The Prophet (ﷺ) said, "I found it (the
horse) like a sea, or, it is the sea indeed."
A man asked permission to enter upon the Prophet. When the Prophet (ﷺ) saw him, he said, "What an evil brother of his tribe! And what an evil son of his tribe!" When that man sat down, the Prophet (ﷺ) behaved with him in a nice and polite manner and was completely at ease with him. When that person had left, 'Aisha said (to the Prophet). "O Allah's Apostle! When you saw that man, you said so-and-so about him, then you showed him a kind and polite behavior, and you enjoyed his company?" Allah's Messenger (ﷺ) said, "O 'Aisha! Have you ever seen me speaking a bad and dirty language? (Remember that) the worst people in Allah's sight on the Day of Resurrection will be those whom the people leave (undisturbed) to be away from their evil (deeds)."
Never was the Prophet (ﷺ) asked for a thing to be given for which his answer was 'no'.