Matsya Purana 206.22

206.22

kṛṣṇaḥ kṛṣṇagalodevaḥ kṛṣṇājinadharastathā.
taddānāddhūtapāpasya prīyatāṃ vṛṣabhadhvajaḥ .. 206.22 ..

In such a way the Agnihotrî Brâhmaṇa accepting the gift should take his bath, wear the pair of garments and he is to be bedecked according to the means of the devotee He is then to accept the gift The gift should be accepted at the tail end and the following formulæ should be uttered on that occasion ‘Lord Mahâdeva who wears the black-deer skin and who has a beautiful blue neck, therefore by the gift of this black deer skin He may be pleased So Kṛṣṇa be pleased’—20-22