Manavashrautasutra 6.2.3.4

6.2.3.4

yā devy asīṣṭake kumāry upaśīvarī \\ itiprabhṛtibhir apyayeṣu tisrastisras \\ yā devy asīṣṭaka āyurdās \\ iti navasv anuṣajati \\ upaśīvarī \\ ity upariṣṭād yā devīḥ stheṣṭakāḥ suśevās \\ iti madhye yugapat tisraḥ //

With [the formulas] beginning with “Which goddess you are, O brick, young girl, lying beside,” [he places] three in each junction; with “Which goddess you are, O brick, granting life,” he attaches [it] to the nine; with “Lying beside,” above; with “Which goddesses you are, O bricks, very gracious,” [he places] three together in the middle.