Shiva Purana
तद्दिनं हि समारभ्य ब्रह्मविष्ण्वादिभिः सरैः । धार्यते त्रितयं तच्च दर्शनात्पापहारकम् १७ ।
From that time onwards Brahmā, Viṣṇu and other Devas wear these three. Their very sight dispels sins.
english translation
taddinaM hi samArabhya brahmaviSNvAdibhiH saraiH । dhAryate tritayaM tacca darzanAtpApahArakam 17 ।
hk transliteration by Sanscript