If you need a copy of BIND to build and install, BIND's source code is freely available. The source code for BIND 9.6.1-P1, the latest release of BIND 9 as of this writing, is available via anonymous FTP from ftp.isc.org as /isc/bind9/9.6.1-P1/bind-9.6.1-P1.tar.gz.
Learn more about this topic from DNS & Bind Cookbook.
The DNS & BIND Cookbook presents solutions to the many problems faced by network administrators responsible for a name server. This title is an indispensable companion to DNS & BIND, 4th Edition, the definitive guide to the critical task of name server administration. The cookbook contains dozens of code recipes showing solutions to everyday problems, ranging from simple questions, like, "How do I get BIND?" to more advanced topics like providing name service for IPv6 addresses.