I am downloading the Debian source files for the heimdal package by running this command
apt-get source --download-only heimdal
This downloads the source files for the release sid (unstable). However, what I want are the sources for release stretch (stable). I am running this command on a Debian jessie (oldstable) machine. I tried adding the -t stable option but that still gave me the source files for unstable.
How do I do this?