Allah's and His Prophet's orders

Bukhari :: Book 3 :: Volume 34 :: Hadith 366
Narrated Jarir:
I have given a pledge of allegiance to Allah's Apostle for to testify that None has the right to be worshipped but Allah, and Muhammad is His Apostle, to offer prayers perfectly, to pay Zakat, to listen to and obey (Allah's and His Prophet's orders), and to give good advice to every Muslim.

Bukhari :: Book 3 :: Volume 34 :: Hadith 367
Narrated Tawus:
Ibn 'Abbas said, "Allah's Apostle said, 'Do not go to meet the caravans on the way (for buying their goods without letting them know the market price); a town dweller should not sell the goods of a desert dweller on behalf of the latter.' I asked Ibn 'Abbas, 'What does he mean by not selling the goods of a desert dweller by a town dweller?' He said, 'He should not become his broker.' "

Bukhari :: Book 3 :: Volume 34 :: Hadith 369
Narrated Abu Huraira:
Allah's Apostle said, "A buyer should not urge a seller to restore a purchase so as to buy it himself, and do not practice Najsh; and a town dweller should not sell goods of a desert dweller."

Bukhari :: Book 3 :: Volume 34 :: Hadith 371
Narrated Abu Huraira:
The Prophet forbade the meeting (of caravans) on the way and the selling of goods by an inhabitant of the town on behalf of a desert dweller.

Bukhari :: Book 3 :: Volume 34 :: Hadith 372
Narrated Tawus:
I asked Ibn 'Abbas, "What is the meaning of, 'No town dweller should sell (or buy) for a desert dweller'?" Ibn 'Abbas said, "It means he should not become his broker."

Bukhari :: Book 3 :: Volume 34 :: Hadith 374
Narrated 'Abdullah bin Umar:
Allah's Apostle said, "You should not try to cancel the purchases of one another (to get a benefit thereof), and do not go ahead to meet the caravan (for buying the goods) (but wait) till it reaches the market."

Bukhari :: Book 3 :: Volume 34 :: Hadith 375
Narrated 'Abdullah:
We used to go ahead to meet the caravan and used to buy foodstuff from them. The Prophet forbade us to sell it till it was carried to the market.