Volume 3, Book 34, Number 336:
Narrated Abdullah ibn Umar:
Allah’s Apostle said, “He who buys foodstuff should not sell it till he is satisfied with the measure
with which he has bought it.

Volume 2, Book 13, Number 50:
Narrated ‘Abdullah Ibn Umar:
The Prophet used to deliver two Khutbas and sit in between them