Valmiki Ramayana Bala Kanda Sarga 60 Shloka 17
Original Shlokaत्रिशङ्को गच्छ भूयस्त्वं नासि स्वर्गकृतालय:।।1.60.17।। गुरुशापहतो मूढ पत भूमिमवाक्छिरा:।
1 source checked for this shloka
त्रिशङ्को O Trishanku, स्वर्गकृतालय: inhabitant of heaven, न असि you are not fit, त्वम् you, भूय: again, गच्छ go back, गुरुशापहतः doomed by the curse of your spiritual preceptor, मूढ O Fool, अवाक्छिरा: with head downwards, भूमिम् to earth, पत fall down.
"O Trisanku you are not fit to inhabit heaven. Go back, you fool Doomed by the curse of your spiritual preceptor, fall on earth, head down.