B.G 18.19

ज्ञानं कर्म च कर्ता च त्रिधैव गुणभेदतः। प्रोच्यते गुणसङ्ख्याने यथावच्छृणु तान्यपि ॥१९॥

jñānaṁ karma ca kartā ca tridhaiva guṇabhedataḥ। procyate guṇasaṅkhyāne yathāvacchṛṇu tānyapi ॥19॥

[ज्ञानम् (jñānam) - knowledge; कर्म (karma) - action; च (ca) - and; कर्ता (kartā) - doer; च (ca) - and; त्रिधा (tridhā) - threefold; एव (eva) - certainly; गुणभेदतः (guṇabhedataḥ) - by the division of qualities; प्रोच्यते (procyate) - is declared; गुणसङ्ख्याने (guṇasaṅkhyāne) - in the enumeration of qualities; यथावत् (yathāvat) - as it is; शृणु (śṛṇu) - hear; तानि (tāni) - them; अपि (api) - also;]

Knowledge, action, and the doer are classified threefold according to the qualities. Listen to them as they are explained in the enumeration of qualities.

Gīta Tātparya 18.19

Term 'guṇasaṅkhyāne' refers to the supreme Sāṅkhya philosophy.

एवं गुणसङ्ख्याने परमसाङ्ख्यशास्त्रे॥

evaṁ guṇasaṅkhyāne paramasāṅkhyaśāstre॥

[एवं (evaṁ) - thus; गुणसङ्ख्याने (guṇasaṅkhyāne) - the term 'guṇasaṅkhyāne'; परमसाङ्ख्यशास्त्रे (paramasāṅkhyaśāstre) - in the supreme Sāṅkhya philosophy;]

Thus, the term 'guṇasaṅkhyāne' refers to the supreme Sāṅkhya philosophy.