Valmiki Ramayana Sundara Kanda Sarga 40 Shloka 5

तिलके when tilaka mark, प्रणष्टे got erased, त्वया by you, मनश्शिलायाः with a grind stone, तिलकः tilaka (mark on forehead), गण्डपार्श्वे stone near by, निवेशितः किल painted indeed, तम् that tilaka, स्मर्तुम् to remember, अर्हसि you will.

'(Further remind him), 'When my tilaka mark was erased, you painted tilaka with a stone (manassita pigment) nearby. O Rama you should remember that (incident).