bka'i chu babs bzhi

four rivers of the teachings [RY]

the four streams of teachings; 1) conventional textual exegeses with commentaries and lecture notes. 2) instructions of the aural lineage with their essential writings and guidance which lays bare the teaching. 3) blessing and empowerment with the means for its conferral and the introductions to reality [transmissions], 4) practical techniques with the rites of enlightened activity, applications, and protector rites) [IW]

the four streams of teachings [IW]