yajña-dāna-tapaḥ-karma

na tyājyaṁ kāryam eva tat

yajño dānaṁ tapaś caiva

pāvanāni manīṣiṇām

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 - Bhagavad Gita 18.5 

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Acts of sacrifice, charity and penance are not to be given up; they must be performed. Indeed, sacrifice, charity and penance purify even the great souls.