Vaisesika Sūtra 1.1.9

द्रव्यगुणयोः सजातीयारम्भकत्वं साधर्म्यम् ॥९॥

dravya-guṇayoḥ sajātīya-ārambhakatvaṁ sādharmyam ॥9॥

[द्रव्य-गुणयोः (dravya-guṇayoḥ) - of substance and quality; सजातीय-आरम्भकत्वम् (sajātīya-ārambhakatvam) - the property of originating things of the same kind; साधर्म्यम् (sādharmyam) - similarity;]

Substances and qualities, both having beginning in the same class, is pocessed with 'sadharma', i.e. common DHARMA, i.e. common properties.