One verse

Srimad Bhagavatam 11.21.10

11.21.10

द्रव्यस्य शुद्ध्यशुद्धी च द्रव्येण वचनेन च । संस्कारेणाथ कालेन महत्वाल्पतयाथवा ॥ १० ॥

dravyasya śuddhy-aśuddhī ca dravyeṇa vacanena ca saṁskāreṇātha kālena mahatvālpatayātha vā

dravyasya
of an object
śuddhi
purity
aśuddhī
or impurity
ca
and
dravyeṇa
by another object
vacanena
by speech
ca
and
saṁskāreṇa
by ritual performance
atha
or else
kālena
by time
mahatva-alpatayā
by greatness or smallness
atha vā
or else

An object’s purity or impurity is established by application of another object, by words, by rituals, by the effects of time or according to relative magnitude.