Volume 3, Book 35, Number 447:
Narrated Muhammad bin Al-Majalid:
Abdullah bin Shaddad and Abu Burda sent me to ‘Abdullah bin Abi Aufa and told me to ask ‘Ab –
dullah whether the people in the life-time of the Prophet used to pay in advance for wheat (to be de –
livered later). Abdullah replied, “We used to pay in advance to the peasants of Sham for wheat, bar –
ley and olive oil of a known specified measure to be delivered in a specified period.” I asked (him),
“Was the price paid (in advance) to those who had the things to be delivered later?” Abdullah bin
Aufa replied, “We did not use to ask them about that.” Then they sent me to ‘Abdur Rahman bin Abza
and I asked him. He replied, “The companions of the Prophet used to practice Salam in the life-time
of the Prophet; and we did not use to ask them whether they had standing crops or not.”