"You have condemned and murdered innocent men, who were not opposing you." NIV translation
James goes on to explain that this hoarding of wealth has caused the death of innocent people. By not sharing with those in need, many are dying of hunger and disease. We also miss opportunities to tell them about Jesus which is the reason that we share with them.
"Be patient, then, brothers, until the Lord's coming. See how the farmer waits for the land to yield its valuable crop and how patient he is for the autumn and spring rains. You too, be patient and stand firm, because the Lord's coming is near." NIV translation
James now turns to the Christians to give them encouragement. We must remember that, at this time, most of the Christians were from the very poor class and so they would have seen the rich people (most of which did not know Jesus) prospering while they were not. It is easy to start grumbling against God (just like the Israelites did in Malachi 3) but James is reminding them and us to be patient.
He uses the example of a farmer who has to wait for the proper season of harvest. You don't plant a seed in the ground and then get mad because you don't have a plant with vegetables on it the next day.
"Don't grumble against each other, brothers, or you will be judged. The Judge is standing at the door!" NIV translation
James urges us to get along as brothers and sisters and warns that we will be judged for fighting and complaining. It seems that many Christians spend more time complaining about other Christians than they do talking to the lost. James reminds us that, as Christians, we have more important things to do than complaining.
"Brothers, as an example of patience in the face of suffering, take the prophets who spoke in the name of the Lord." NIV translation
James reminds us of the Old Testament prophets. Most of them delivered a message from God that was not immediately accepted and some delivered a message that was never accepted. They demonstrated patience in spite of ridicule and persecution as they waited for the words of God to come to pass. We can be encouraged by the fact that God's words will happen but it may not be as fast as we desire.