Postillate /(?)/

Pos·til·late

Postillate

v. t.
  1. To explain by marginal notes; to postil.
    Tracts . . . postillated by his own hand.
    — C. Knight.

Postillate

v. i.
  1. To write postils; to comment.
  2. To preach by expounding Scripture verse by verse, in regular order.