Few problems are more obscure than the question of the growth of baptism in the Church of this first period. This is due to the fact that the editor of Acts was convinced that baptism was a primitive Christian custom even in Jerusalem, though unlike Matthew he does not attribute it to Jesus. Nevertheless, it is possible to see indications that his sources did not confirm his opinion. An excellent case can be made for the view that the source used in Acts i. and ii. originally regarded the gift of the Spirit at Pentecost as the fulfilment of the promise attributed to Jesus {87} that his disciples, unlike those of John, should be baptized in the Holy Spirit not in water. The exhortation of Peter in Acts ii. that his hearers should repent _and be baptized_ is so inconsistent with this promise that it seems due to the redactor. Similarly, too, the baptism of Cornelius seems to contradict the context of Peter's own explanation in Acts xi., and may well be redactorial. On the other hand, the later chapters agree with these redactorial additions in regarding baptism as the source of the gift of the Spirit, and there can here be no question of editorial additions, for the references to baptism are clearly part of the fabric of the narrative. The most illuminating evidence, however, is afforded by the chapters describing Philip's work: in these baptism in the name of the Lord Jesus is represented as the custom of Philip, but it does not confer the gift of the Spirit. This may be the best clue to the historical development of the rite. The Seven, including Philip, were probably the first to convert Gentiles, and inasmuch as the complete breach with Judaism had not yet come, must have regarded their converts as proselytes, and treated them accordingly. Baptism was part of the usual treatment of a proselyte, and the formula "in the name of the Lord Jesus" would merely distinguish these proselytes from others. A little later the practice would certainly be interpreted by Greeks, or Graeco-Orientals, in the light of the cults which they knew; baptism would become the magical or, at least, sacramental means of {88} salvation, and the Name of Jesus its necessary formula. The development is exactly similar to that passed through by the word "Lord,"--though its origin was Jewish its interpretation was Greek.[7]