Anupubbi-kathā

feminine a gradual instruction, graduated sermon regulated exposition of the ever higher values of four subjects (dāna-kathā, sīla˚, sagga˚, magga˚) i.e. charity righteousness, the heavens, and the Path. Bdhgh. explains the term as anupubbikathā nāma dānânantaraṃ sīlaṃ sīlânantaro saggo saggânantaro maggo ti etesaṃ dīpana-kathā (DN-a.i.277). Vin.i.15, Vin.i.18; Vin.ii.156, Vin.ii.192; DN.i.110; DN.ii.41; MN.i.379; Ja.i.8; Vv-a.66, Vv-a.197, Vv-a.208; DN-a.i.308; Dhp-a.i.6; Mil.228
■ The spelling is frequently ānupubbikathā (as to lengthening of anu see anu Note
a), e.g. at DN.i.110; DN.ii.41; MN.i.379; Ja.i.8; Mil.228.

anupubba + kathā, formation like dhammi-kathā