Garudapurana 1.48.12

1.48.12

paścime gopatirnāma suraśārdūlamuttare /
agnimīleti hi mantreṇa prathamaṃ pūrvato nyaset //

at the western the bull, at the northern a tiger of the gods. / With the mantra beginning with "agnim īḷe", he should first place [one] in the east;