When Moses was distressed because of the greatness of the task of leading the children of Israel through the wilderness, God commanded him to gather seventy elders to help him carry the burden (Numbers 11:16). Moses gathered the seventy round about the tabernacle and the spirit that was on Moses rested on the seventy (Numbers 11:24-25).
However, two men were not of the seventy and they did not go to the tabernacle: Eldad and Medad (Numbers 11:26-29). Yet, "they were of them that were written" and "the spirit rested upon them" and "they prophesied in the camp" (v.26). When Joshua heard of their preaching, he asked Moses to forbid them but Moses refused: "Enviest thou for my sake? would God that all the LORD'S people were prophets, and that the LORD would put his spirit upon them!"
Are you of them that are written? Are you full of envy over what someone else is doing? Or, are you simply serving God with all you might in the camp where He has left you?