Valmiki Ramayana Kishkindha Kanda Sarga 9 Shloka 14
Original Shlokaमया त्वेतद्वचश्श्रुत्वा याचितस्स परन्तपः। शापयित्वा तु मां पद्भ्यां प्रविवेश बिलं महत्4.9.14।।
1 source checked for this shloka
एतत् this, वचः words, श्रुत्वा after hearing, मया me, याचितः begged, परन्तपः scorcher of enemies, सः he, माम् me, पद्भ्याम् on his feet, शापयित्वा made me swear, महत् great, बिलम् cave, प्रविवेश entered.
'On hearing him, I begged the scorcher of enemies (Vali) that I would follow him, but he made me swear on his feet and entered the cave.