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trayam-antar-aṅgaṃ pūrvebhyaḥ
The three are the internal limb from the preceding
traya - the three
antar - internal
aṅga - limb
pūrva - preceding
Commentary by TKV Desikachar:
“Pūrva Aṅga is essentially a process of elimination in which we eliminate those thoughts that are not relevant. In fact Yoga is the process of eliminating the undesirable so we can be linked with the desirable. It is the movement from Saṃyoga to Viyoga, from Saguṇa to Nirguṇa. But we must be careful how we define desirable or undesirable.” – TKV Desikachar Madras December 19th 1988