"The Dhammapada is an anthology of verses, belonging to the part of the
Theravada Pali Canon of scriptures known as the Khuddaka Nikaya, and
consists of 423 verses.
Something like a quarter of the verses are to be found in other parts of
the Pali Tipitaka, particularly in the other verse parts of the Khuddaka
Nikaya such as the Sutta Nipata and the Thera- and Theri-gatha.
The Dhammapada is probably the most popular book of the Pali Canon, with
the possible exception of the Satipatthana Sutta, or the Sutta on the
Turning of the Wheel of the Law (Dhamma-cakka-ppavattana Sutta). It is
certainly the most frequently translated portion."
John Richards (19.Oct.1993)