Valmiki Ramayana Sundara Kanda Sarga 62 Shloka 27
Original Shlokaमदान्धश्च न वेदैनमार्यकोऽयं ममेति सः। अथैनं निष्पिपेषाशु वेगवद्वसुधातले।।5.62.27।।
1 source checked for this shloka
सः he, मदान्धश्च blinded by arrogance, अयम् this, मम my, आर्यकः revered, इति this, एनम् therefore, न वेद not understnding that (I am his granduncle), अथ now, एनम् therefore, वसुधातले on the floor, वेगवत् forcibly, आशु him, निष्पिपेष pushed.
"Blinded by arrogance, the prince pushed him (Dadhimukha) on the floor forcibly, forgetting that he was his revered granduncle.