False witness

Bukhari :: Book 3 :: Volume 48 :: Hadith 821 Narrated Anas:
The Prophet was asked about the great sins He said, "They are:--
(1 ) To join others in worship with Allah,
(2) To be undutiful to one's parents.
(3) To kill a person (which Allah has forbidden to kill) (i.e. to commit the crime of murdering).
(4) And to give a false witness."

Bukhari :: Book 3 :: Volume 48 :: Hadith 822 Narrated Abu Bakra:
The Prophet said thrice, "Should I inform you out the greatest of the great sins?" They said, "Yes, O Allah's Apostle!" He said, "To join others in worship with Allah and to be undutiful to one's parents." The Prophet then sat up after he had been reclining (on a pillow) and said, "And I warn you against giving a false witness, and he kept on saying that warning till we thought he would not stop. (See Hadith No. 7, Vol. 8)

Bukhari :: Book 3 :: Volume 48 :: Hadith 824 Narrated Abdullah bin Umar:
The Prophet said, "Bilal pronounces the Adhan when it is still night (before dawn), so eat and drink till the next Adhan is pronounced (or till you hear Ibn Um Maktum's Adhan)." Ibn Um Maktum was a blind man who would not pronounce the Adhan till he was told that it was dawn.

Bukhari :: Book 3 :: Volume 48 :: Hadith 825 Narrated Al-Miswar bin Makhrama:
Some outer garments were received the Prophet and my father (Makhrama) said to me, "Let us go to the Prophet so that he may give us something from the garments." So, my father stood at the door and spoke. The Prophet recognized his voice and came out carrying a garment and telling Makhrama the good qualities of that garment, adding, "I have kept this for you, I have sent this for you."

Bukhari :: Book 3 :: Volume 48 :: Hadith 826 Narrated Abu Said Al-Khudri:
The Prophet said, "Isn't the witness of a woman equal to half of that of a man?" The women said, "Yes." He said, "This is because of the deficiency of a woman's mind."