Luke names none of these missionaries. He gives us only a number — and to an ear raised on the Hebrew Scriptures, the number is the sermon. Turn to Genesis 10, the morning after the flood: a family tree of the whole human race, the “table of the nations.” Count them and you get seventy peoples — seventy in the Hebrew text, seventy-two in the old Greek translation. From then on, “seventy” was Jewish shorthand for every nation on earth.
Now turn to Numbers 11. Moses is buckling — “I alone am not able to carry all this people” — and God answers by taking the Spirit that rested on Moses and putting it on seventy elders, who prophesy. When two of them, Eldad and Medad, keep prophesying out in the camp, Joshua wants them stopped. Moses refuses, and makes one of the great wishes of the Old Testament: “Would that all the LORD’s people were prophets, that the LORD would put His Spirit upon them!” (Numbers 11:29). One man’s calling, spread across seventy shoulders — and a wish that it would someday spread to everyone.
Hold both scenes and look at the road. Since Luke 9:51 Jesus has been walking with His face set toward Jerusalem — toward the cross — and there are more towns left than days. The Twelve were sent once (Event 68). Now comes a wider wave: seventy ordinary followers, carrying the Master’s own message on the Master’s own errand. Moses’ wish is starting to come true — and the number quietly promises it won’t stop at Israel’s borders.