Skandapurana 6.3.218.51

6.3.218.51

sarvaratnanidhānastvaṃ sarvaratnākarākaraḥ .
sarvāmarapradhāneśa gṛhāṇārghaṃ namo'stu te .
ityarghamantraḥ .. 218.51 ..

“You are the repository of all jewels, the source of all treasuries of jewels, / the lord supreme among all immortals; accept the water oblation, salutations to you!”
— Thus is the mantra for offering water oblation.