One verse

Srimad Bhagavatam 11.21.14

11.21.14

स्‍नानदानतपोऽवस्थावीर्यसंस्कारकर्मभि: । मत्स्मृत्या चात्मन: शौचं शुद्ध: कर्माचरेद्‌द्विज: ॥ १४ ॥

snāna-dāna-tapo-’vasthā- vīrya-saṁskāra-karmabhiḥ mat-smṛtyā cātmanaḥ śaucaṁ śuddhaḥ karmācared dvijaḥ

snāna
by bathing
dāna
charity
tapaḥ
austerity
avasthā
by virtue of one’s age
vīrya
potency
saṁskāra
execution of ritual purification
karmabhiḥ
and prescribed duties
mat-smṛtyā
by remembrance of Me
ca
also
ātmanaḥ
of the self
śaucam
cleanliness
śuddhaḥ
pure
karma
activity
ācaret
he should perform
dvijaḥ
a twice-born man

The self can be cleansed by bathing, charity, austerity, age, personal strength, purificatory rituals, prescribed duties and, above all, by remembrance of Me. The brāhmaṇa and other twice-born men should be duly purified before performing their specific activities.