Bhagavad Gita Chapter 18.5
yajña-dāna-tapaḥ-karma
na tyājyaḿ kāryam eva tat
yajño dānaḿ tapaś caiva
pāvanāni manīṣiṇām
Translation
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.