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John_C said:
(other OT feasts)

I do not have any reference books available and I wonder how to respond to those who argue for paedo-communion.

The correct way to respond is with scripture alone not with human speculation or tradition. Infants are to be baptized because the promise belongs to them (Acts 2:38, 39) but infants are not to be communed until they can examine themselves (1 Cor. 11:28).