Be equitable in your dealings & exchanges; strive for fairness & justice; be mindful about how you use resources

This hadith speaks about the importance of being equitable in our dealings and exchanges. Saad ibn Abi Waqqas was running low on fodder for his donkeys, so he instructed his slave to take some of the family's wheat and buy barley with it, but only take a like quantity. This teaches us that when we are exchanging goods or services, we should be sure to do so in an equitable manner - taking no more than what is due or necessary. We should also be mindful not to take advantage of others in our transactions; rather, we should strive for fairness and justice in all our dealings. Furthermore, this hadith also highlights the importance of being mindful about how we use resources - even if they are ours - as Saad ibn Abi Waqqas was careful not to waste any more than what was necessary when replenishing supplies for his donkeys.