SB 12.6.38
yad-upasanaya brahman
yogino malam atmanah
dravya-kriya-karakakhyam
dhutva yanty apunar-bhavam
Translation:
By worship of this subtle form of the Vedas, O brahmana, mystic sages cleanse their hearts of all contamination caused by impurity of substance, activity and doer, and thus they attain freedom from repeated birth and death.