Acts 8:38

Verse 38. We are not to suppose that in the administration of the sacraments in the primitive Church, nothing more was done than what we read, totidem litteris, in the Scripture. S. Augustin answers this, when he says: “insomuch that he saith, Philip baptized him, he would have it understood, that all things were done, which though in the Scripture, for brevity sake, they are not mentioned, yet by order of tradition we know were to be done.”