Tertullian, Against Marcion 4.24
He also brings forward another seventy apostles on top of the twelve. After all, if the twelve correspond to the seventy-two springs at Elim, why would the seventy not correspond to the seventy-two palm groves? (Exodus 15:27) It is antithesis that created the greatest diversity of causes, not of powers. But whoever failed to consider the diversity of causes easily assumed it was a diversity of powers. "The Creator led the procession of the sons of Israel out of Egypt, packed with those spoils of gold and silver vessels and garments, in addition to the burdens of the sprinklings; Christ, however, did not even prescribe that the disciples carry a staff for the journey." For the former were being led into the wilderness, while these were being sent into cities. Consider the offering of the causes, and you will understand one and the same power, which arranged the expedition of its own according to lack and abundance—accordingly, it was to abound through the cities, having circumcised, just as it had also constructed it to be led through the wilderness. He even forbade them to carry sandals. For he himself was the one under whom the people had not worn out their sandals in the wilderness for so many years.
Latin
Adlegit et alios septuaginta apostolos super duodecim. quo enim duodecim secundum totidem fontes in Elim, si non et septuaginta secundum totidem arbusta palmarum? Antithesis plurimum causarum diuersitas fecit, non potestatum. sed qui diuersitatem causarum non respexit, facile eam potestatum existimauit. 'profectionem filiorum Israhelis creator etiam illis spoliis aureorum et argenteorum uasculorum et uestium praeter oneribus consparsionum offarcinatam educit ex Aegypto, Christus autem nec uirgam discipulis in uiam ferre praescripsit'). illi enim in solitudinem promouebantur, hi autem in ciuitates mittebantur. considera causarum offerentiam, et intelleges unam et eandem potestatem, quae secundum penuriam et copiam expeditionem suorum disposuit, proinde per ciuitates abundaturam circumcidens, sicut et egituram per solitudinem struxerat. etiam calciamenta portare uetuit illos. ipse enim erat, sub quo nec in solitudine per tot annos populus calciamenta detriuerat.