Khadiragrihyasutra 2.2.20

2.2.20

athāparaṃ nyagrodhaśuṅgāmubhayataḥphalāmasrāmāmakrimiparisṛptāṃ trissaptairyavaiḥ parikrīyotthāpayenmāṣairvā sarvatrauṣadhayassumanaso bhūtvā 'syāṃ vīryaṃ samādhatteyaṃ karma kariṣyatīti / 20

Then another (ceremony). Having bought for three times seven barley corns or beans, a Nyagrodha-shoot which has fruits on both sides, which is not dry, and not touched by worms, he should set that up with (the formula), Ye herbs everywhere, being well-minded, bestow strength on this (shoot); for it will do its work.'