Shankhayanagrihyasutra 3.2.5

3.2.5

: uda manthān āsicya /

And with (the verse), 'This branch of the immortal one I erect, a stream of honey, promoting wealth. The child, the young one, cries to it; the cow shall low to it, the unceasingly fertile one'—he puts an Udumbara branch which has been besmeared with ghee into the pit for the right door-post.