Abdullah ibn Abi Aufa
1) Narrated 'Abdullah bin Abi Aufa:
A man displayed some goods in the market and took a false oath that he had been offered so much for them though he was not offered that amount Then the following Divine Verse was revealed:-- "Verily! Those who purchase a little gain at the cost of Allah's covenant and their oaths . . . Will get painful punishment." (3.77) Ibn Abi Aufa added, "Such person as described above is a treacherous Riba-eater (i.e. eater of usury). 
2) Abdullah bin Abi Aufa:
"The Prophet used to say: 'Allahumma tahhirni bith-thalji wal-barad wal-ma' al-barid, Allahumma tahhirni min adh-dhunub kama yutahhar ath-thawb al-abyad min ad-danas (O Allah, purify me with snow and hail and cold water, O Allah, purify me of sin as a white garment is cleansed of dirt)."
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