Khadiragrihyasutra 2.1.24

2.1.24

sviṣṭakṛtassakṛdupastīrya dvirbhṛgūṇāṃ sakṛddhaviṣo dvirabhighāryāgnaye sviṣṭakṛte svāheti prāgudīcyāṃ juhuyāt / 24

At the Svishtakrit oblation he 'spreads under' once—twice if he is a Bhrigu—(cuts off) once (a portion) of the Havis, sprinkles (Âgya) on it twice, and sacrifices it in a north-eastern direction with (the formula), 'To Agni Svishtakrit Svâhâ!