Luther: “There is not sufficient evidence from Scripture that one might justify the introduction of infant baptism at the time of the early Christians after the apostolic period. . . . But so much is evident, that no one may venture with a good conscience to reject or abandon infant baptism, which has for so long a time been practiced.”

Zwingli: “Nothing grieves me more than that at the present I have to baptize children, for I know it ought not to be done. . . . If however I were to terminate the practice, then I fear that I would lose my prebend [stipend]. . . . if we were to baptize as Christ instituted it then we would not baptize any person until he has reached the years of discretion, for I find it nowhere written that infant baptism is to be practiced.”

I've heard them quoted in sermons but haven't been able to find the sources.

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J. M. Esq., P.V.P.M.P.C. [Perpetual Vice-President--Member Pickwick Club]
Baptist - Ontario, Canada - Feileadh Mor - The Orthodox Catechism