Sahih Bukhari

Narrated Ibrahim:The companions of `Abdullah (bin Mas`ud) came to Abu Darda', (and before they arrived at his home), he looked for them and found them. Then he asked them,: 'Who among you can recite (Qur'an) as `Abdullah recites it?"" They replied, ""All of us."" He asked, ""Who among you knows it by heart?"" They pointed at 'Alqama. Then he asked Alqama. ""How did you hear `Abdullah bin Mas`ud reciting Surat Al-Lail (The Night)?"" Alqama recited: 'By the male and the female.' Abu Ad-Darda said, ""I testify that I heard me Prophet reciting it likewise, but these people want me to recite it:-- 'And by Him Who created male and female.' but by Allah, I will not follow them