The Haggadah gives the most extravagant descriptions of the glory of Adam before his fall.
(Rabbi) Ishmael, is a useful source for old Haggadah (especially on the narrative portions of Exodus), and is interesting for its variant readings of the Canonical Massoretic text.
(f) Shir (" song ") R., or (after the opening words) Aggadath Hazith, a late compilation of haggadah on Canticles, illustrating the allegorical interpretation of the book in reference to the relation between God and Israel (so already in the exegesis of R.