Shiva Purana
सर्वोपनिषदां सारं समालोक्य मुहुर्मुहुः । इदमेव हि निर्णीतं परं श्रेयस्त्रिपुंड्रकम् ७३ ।
After going through the essence of all Upaniṣads again and again, this is what has been arrived at that the Tripuṇḍra is conducive to great excellence.
english translation
sarvopaniSadAM sAraM samAlokya muhurmuhuH । idameva hi nirNItaM paraM zreyastripuMDrakam 73 ।
hk transliteration by Sanscript