what is a gospel reading which expresses how Jesus' actions lead to the development of baptism?

Question

It must also explain a symbol of baptism. e.g water.

Answer 1

http://www.scripturecatholic.com/baptism.html

This link contains practically everything from the scriptures on baptism and its symbolism. You will have to read it and put it together but it is a very good reference site.

A deeper book is Fundamentals of Catholic Dogma by Ott which explains everything from several perspectives and relies heavily on scripture.

Answer 2

Here are two good sites on this topic. (but there are many more) Both have many scripture passages and talk of different symbolisms.

I hope it helps.