Muhammad or `Abdullah bin Abu AlMujalid said, "Abdullah bin Shaddad and Abu Burda differed regarding AsSalam, so they sent me to Ibn Abi `Aufa and I asked him about it. He replied, 'In the lifetime of Allah's Messenger (ﷺ), Abu Bakr and `Umar, we used to pay in advance the prices of wheat, barley, dried grapes and dates to be delivered later.