Debian Jessie repos
Here are the Debian Jessie repos which I use for many of my systems:
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# Debian Jessie Repos
#------------------------------------------------------------------------------#
# these repos are pretty standard
deb http://httpredir.debian.org/debian/ jessie main contrib non-free
deb-src http://httpredir.debian.org/debian/ jessie main contrib non-free
# jessie/updates, previously known as 'jessie'
deb http://security.debian.org/ jessie/updates main contrib non-free
deb-src http://security.debian.org/ jessie/updates main contrib non-free
# jessie-updates, previously known as 'jessie'
deb http://httpredir.debian.org/debian/ jessie-updates main contrib non-free
deb-src http://httpredir.debian.org/debian/ jessie-updates main contrib non-free
# backports for Debian 'stretch'
deb http://ftp.debian.org/debian jessie-backports main contrib non-free
# dotdeb packages
deb http://packages.dotdeb.org jessie all
deb-src http://packages.dotdeb.org jessie all
I generally pull the dotdeb repository because it's kept up to date, but in many instances, backports works pretty well when I more up-to-date packages.
In this instance I've also included the non-free packages. You may remove the "non-free" revision if it doesn't suit your needs.
You can find out how to utilize backports, among other things through APT via the BASH cheatsheet wiki entry.