Shiva Purana
मध्येंगुलिभिरादाय तिसृभिर्भस्म यत्नतः । त्रिपुण्ड्रधारयेद्भक्त्या भुक्तिमुक्तिप्रदं परम् ८७ ।
With the three middle fingers, take the ashes and apply the Tripuṇḍra on the forehead. It would give worldly pleasures and salvation.
english translation
madhyeMgulibhirAdAya tisRbhirbhasma yatnataH । tripuNDradhArayedbhaktyA bhuktimuktipradaM param 87 ।
hk transliteration by Sanscript