Natyashastra
सर्व रक्तं प्रदातव्यं द्विजेभ्यश्च गुडौदनम् । वैश्यस्तम्भे विधिः कार्यो दिग्भागे पश्चिमोत्तरे ॥ ४८॥
The offering of all red (sārva raktaṃ) should be given to the Brahmins (dwijebhyaśca gudaudanam). For the Vaishya pillar (vaiśya-stambhe), the procedure should be carried out in the western or northern directions (digbhāge paścimottare).
english translation
sarva raktaM pradAtavyaM dvijebhyazca guDaudanam । vaizyastambhe vidhiH kAryo digbhAge pazcimottare ॥ 48॥
hk transliteration by Sanscript