Anandakanda 1.2.90

1.2.90

pūrvavatpañcapātrāṇi pūrayecchuddhavāriṇā /
nikṣipenmadhyage sūtaṃ ratnaṃ dakṣiṇake kṣipet //

As before, one should fill the five vessels with pure water;
one should cast quicksilver into the central one, and one should cast a jewel into the southern one.