Delegation is more difficult than it sounds. Delegation is especially difficult for talented and extraordinary leaders, and even more difficult for leaders who seem to have a special calling from God. That was the case with Moses some 13 centuries before Christ. After successfully leading the Israelites out of slavery in Egypt toward freedom in the Promised Land, Moses had problems with a somewhat rebellious and cantankerous group.
So he complained to God, "I am not able to carry all these people alone, the burden is too heavy for me" (Numbers 11:14). In fact, Moses was so discouraged he asked God to kill him unless he helped him.
So God asked Moses to gather 70 men whom he knew to be natural leaders and officers and to bring them to the tent of meeting, where God manifested his presence. God said, "I will come down and talk with you there; and I will take some of the spirit which is upon you and put it upon them; and they shall bear the burden of the people with you, that you may not bear it yourself alone" (Numbers 11:17). So God's spirit did come upon the 70 and Moses had people to whom he could delegate responsibility and leadership.
Thirteen centuries later, Jesus uses the same number 70 (some manuscripts say 72) to recruit men to help him spread the word about the new kingdom of God. If Moses and the 70 elders were developing the Old Israel, Jesus and the 70 were about to develop the New Israel.