Varahashrautasutra 3.3.2.28

3.3.2.28

apo devīrityabhimantryānibhṛṣṭamasīti śatakṛṣṇalam̐ rukmam̐ śatātṛṇṇamādāya tena saha śukrā vaḥ śukreṇa punāmīti pūyovāvadito'nuṣajatyastho gāyatryā trī rukmeṇotpūya pālāśamāśvatthamaudumbaraṃ naiyagrodhamiti pātrāṇi teṣu rājasūyā ityapo vyānayati

Having addressed them with 'Waters divine...', and taking a golden plate of a hundred kṛṣṇalas with a hundred perforations, saying 'You are unburned', and having together with it purified them three times with the gold plate with the Gāyatrī, saying 'Pure I purify you with the pure...', he fastens it, and divides the waters into the vessels—namely of palāśa, aśvattha, udumbara, and nyagrodha wood—with the formulas beginning with 'Rājasūya...'