I found an archive with the source of the early Lisa Pascal by Silicon Valley Software.

The archive contains images of Lisa disks in dc42 format. In these disk images are the sources (and more) of the Silicon Valley Software Pascal compiler for the Lisa.

The archive, together with sources of the Lisa Operating system and relevant manuals is available here.
The sources are available as original disk images, in Lisa Pascal TEXT and OBJ file format and, with a utility I wrote, in plain text file format.