I’m looking for an in depth explanation of the Lecha Dodi we say on Friday night. Is there any peirush out there that does this?
Here are a few that contain running commentaries on this hymn:
- The controversial book Hemdat Ha-yamim (vol 1 p. 43).
- R. Moshe [Austrer] of Zamość (Arugat Ha-bosem, 62ff.)
- R. Avenr Afjin (Divrei Shalom vol. 4, 391ff.) Note: some of his commentary is from #1.
I have aslo seen referenced in numerous places a collection entitled 'Tikkunei Shabbat' (pub. 1641) by R. Raphael b. Yaakov of Posen which contains a commentary too, however, I have not seen the book myself.
Here is what I found:
I'm not sure if this is exactly what you are looking for, but the first one is a commentary on the piyut and the second one contains two discourses delivered by the last two Lubavitcher Rebbes. (The first one is all Hebrew and the second one is Hebrew/English.)