"... that they should draw their khimār over their breasts and not display their beauty except to their husband, their fathers, their husband's fathers, their sons, their husbands' sons, their brothers or their brothers' sons, or their sisters' sons, or their (Muslim) women, or the slaves whom their right hands possess, or male servants free of physical needs, or small children who have no sense of the shame of sex..." Quran 24:31
This is what I found in the hadith:
Narrated Safiya bint Shaiba: "Aisha used to say: 'When (the Verse): "They should draw their veils (Khumur) over their necks and bosoms (juyyub)," was revealed, (the ladies) cut their waist sheets at the edges and covered their faces with the cut pieces.'" [Sahih al-Bukhari, 6:60:282, 32:4091] (Wikipedia)
As you can see, the hadith quotes the ayah diffently from the Quran. First, it uses the word "khumur" instead of "khimar". Then, the hadith mentions that the khumur must also be worn over the neck. But the Ayah in the Quran makes no mention of neck.
So was this ayah changed or not?