Baptism

He came to save all through himself – all, I say, who through him are reborn in God; infants, and children, and youths, and old men. Therefore he passed through every age, becoming an infant for infants, sanctifying infants; a child for children, sanctifying those who are of that age . . . . so that he might be the perfect teacher in all things, perfect not only in respect to the setting forth of truth, perfect also in respect to relative age . ~Tertullian (Against Heresies A.D. 189)