Garudapurana 2.41.9

2.41.9

pavitrapratipattiśca brāhmaṇe dakṣaiṇā tataḥ /
ṣaḍaṅgarudrajāpyena proto mokṣamavāpnuyāt //

Then disposal of the purifying kuśa grass, and the priestly gift to the brāhmaṇa; / by the recitation of the Rudra [hymn] with its six limbs, the deceased attains liberation.