Valmiki Ramayana Yuddha Kanda Sarga 95 Shloka 31
Original Shlokaपीड्यमानास्तुबलिनावरदानेनरक्षसा ।।6.95.31।। दीप्स्सैस्तपोभिर्विबुधाःपितामहमपूजयन् ।
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वरदानेन by the boon, बलिना mighty, रक्षसा Rakshasa, पीड्यमानाः tormented, विबुधाः learned, दीप्स्सैः intense, तपोभिः austerities also, पितामहम् Brahma, अपूजयन् worshipped
"Tormented by the oppression of Ravana, on account of the boon (given to him by the creator) and intensity of his austerities, the learned worshipped Brahma."