Like Moses, who organized 70 to assist with the 12 tribes, Christ called 70 to assist Him and His 12 disciples.
And the LORD said unto Moses, Gather unto me seventy men of the elders of Israel, whom thou knowest to be the elders of the people, and officers over them; and bring them unto the tabernacle of the congregation, that they may stand there with thee.
Numbers 11:16
After these things the Lord appointed other seventy also,
and sent them two and two before his face
into every city and place, whither he himself would come.
Luke 10:1