Garudapurana 1.42.13

1.42.13

mṛttikāṃ paścime dadyāddakṣiṇe bhasma bhūtayaḥ /
nairṛtehyaguruṃ dadyācchikhāmantreṇa mantravit //

in the west, he should give clay, [and] in the south, ashes for prosperity; / in the south-west, the knower of mantras should offer agallochum with the śikhā mantra;