Need help Combining (concatenating) Two text Files

[phatzilla 0]

Hey guys, I want to combine two text files i have....

So for example if Text 1(Text1.txt) lines read

Line1

Line2

Line3

Line4

..

..

..

Text 2(text2.txt) Lines read

LineA

LineB

LineC

LineD

..

..

..

I want to be able to combine these into

Text 3 (Text3.txt)

Line1:LineA

Line2:LineB

Line3:LineC

Line4:LineD

So i would essentially combine the lines together with a ":" as a separator.

Can i get some assistance on how to make a script that does this?

[phatzilla 0]

Thanks brother, Merry Christmas