Shahih Al Bukhari :: Volume# 6 :: Book# 61 :: Hadith# 533

Narrated Abu Said Al-Khudri:

A man heard another man reciting (Surat-Al-Ikhlas) ‘Say He is Allah, (the) One.’ (112. 1) repeatedly. The next morning he came to Allah’s Apostle and informed him about it as if he thought that it was not enough to recite. On that Allah’s Apostle said, “By Him in Whose Hand my life is, this Surah is equal to one-third of the Qur’an!”

Shahih Al Bukhari :: Volume# 6 :: Book# 61 :: Hadith# 534

Narrated Abu Said Al-Khudri:

The Prophet said to his companions, “Is it difficult for any of you to recite one third of the Qur’an in one night?” This suggestion was difficult for them so they said, “Who among us has the power to do so, O Allah’s Apostle?” Allah Apostle replied: ” Allah (the) One, the Self-Sufficient Master Whom all creatures need.’ (Surat Al-Ikhlas 112.1–to the End) is equal to one third of the Qur’an.”

Shahih Al Bukhari :: Volume# 6 :: Book# 61 :: Hadith# 536

Narrated ‘Aisha:

Whenever thy Prophet go went to bed every night, he used to cup his hands together and blow over it after reciting Surat Al-Ikhlas, Surat Al-Falaq and Surat An-Nas, and then rub his hands over whatever parts of his body he was able to rub, starting with his head, face and front of his body. He used to do that three times.

Shahih Al Bukhari :: Volume# 7 :: Book# 71 :: Hadith# 644

Narrated ‘Aisha:

Whenever Allah’s Apostle went to bed, he used to recite Surat-al-Ikhlas, Surat-al-Falaq and Surat- an-Nas and then blow on his palms and pass them over his face and those parts of his body that his hands could reach. And when he fell ill, he used to order me to do like that for him.

Shahih Al Bukhari :: Volume# 8 :: Book# 78 :: Hadith# 638

Narrated Abu Sa’id Al-Khudri:

A man heard another man reciting: Surat-ul-Ikhlas (The Unity) ‘Say: He is Allah, the One (112) and he was repeating it. The next morning he came to Allah’s Apostle and mentioned the whole story to him as if he regarded the recitation of that Sura as insufficient On that, Allah’s Apostle said, “By Him in Whose Hand my soul is! That (Sura No. 112) equals one-third of the Qur’an.”