Shiva Purana
तस्माच्छ्राद्धानि देयानि योगिनां तु विशेषतः॥ सर्वेषां राजतं पात्रमथ वा रजतान्वितम्॥ ३॥
Therefore shraddhas should be performed especially for the yogis. A silver vessel or one with silver for all of them.
english translation
tasmAcchrAddhAni deyAni yoginAM tu vizeSataH॥ sarveSAM rAjataM pAtramatha vA rajatAnvitam॥ 3॥
hk transliteration by Sanscript