From the early Church Fathers to now.
“And thou shalt bring Aaron and his sons to the door of the tabernacle of the testimony. And when thou hast washed the father and his sons with water,”
“The high priest washes himself, then offers incense; for Aaron was first washed, then became high priest. For how could one who had not yet been cleansed by water pray for others? Further, the laver had been set within the tabernacle, as a symbol of baptism.”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.