Vaisesika Sūtra 1.1.15

क्रियागुणवत् समवायिकारणम् इति द्रव्यलक्षणम् ॥१५॥

kriyā-guṇavat samavāyikāraṇam iti dravya-lakṣaṇam ॥15॥

[क्रिया-गुणवत् (kriyā-guṇavat) - possessing action and quality; समवायि-कारणम् (samavāyikāraṇam) - inherential cause; इति (iti) - thus; द्रव्य-लक्षणम् (dravya-lakṣaṇam) - the definition of substance;]

The characteristics of the substance are governed by movement possessed with qualities and its inherent causes.