Khadiragrihyasutra 2.1.26

2.1.26

darbhānājye haviṣi vā triravadhāyāgramadhyamūlānyaktaṃ rihāṇā viyantu vaya ityabhyukṣyāgnāvanumahared yaḥ paśūnāmadhipatī rudrastanticaro vṛṣā paśūnasmākaṃ mā hiṃsīretadastu hutaṃ tava svāheti / 26

He should dip Darbha-blades (of the sacrificial grass strewn round the fire) three times, the points, the middle, and the roots, into the Âgya or into the Havis with (the words), 'May the birds come, licking what has been anointed.' Then, after having sprinkled (those Darbha-blades with water), he should throw them into the fire, with (the verse), 'Thou who art the lord of cattle, Rudra, who walkest with the lines (of cattle), the manly one: do no harm to our cattle; let this be offered to thee. Svâhâ!'