Anandakanda 2.5.25

2.5.25

rakṣāyai loharasayorayamevaikamudbhavam /
vinā svāheti tasyānte phaḍantaṃ yojayetpriye //

For the protection of iron and mercury, this very [mantra], but omitting one / 'udbhava' and 'svāhā', one should append with 'phaṭ' at the end, O beloved.