Śatapatha Brāhmaṇa ("of a hundred paths") 13.5.3.8

13.5.3.8

tadu hovāca sātyayajñiḥ itarathaiva kuryuḥ patha eva nāpodityamiti pūrvā tveva sthitirukthyo yajñastenāntarikṣalokamṛdhnoti sarvastomo'tirātra uttamamaharbhavati sarvam vai sarvastomo'tirātraḥ sarvamaśvamedhaḥ sarvasyāptai sarvasyāvaruddhyai

Of the blood of the other victims they make no sacrificial portions; of (that of) the horse they do make portions. Of (the blood of) the others they make portions on the south side, of (that of) the horse on the north side (of the altar); of (the blood of) the others he makes portions on (a mat of) plaksha (ficus infectoria) twigs, of (that of) the horse on rattan twigs.