Śrīmad-Bhāgavatam · Text 8.22.2
Who is speaking and story frame
श्रीबलिरुवाच
यद्युत्तमश्लोक भवान् ममेरितं
वचो व्यलीकं सुरवर्य मन्यते ।
करोम्यृतं तन्न भवेत् प्रलम्भनं
पदं तृतीयं कुरु शीर्ष्णि मे निजम् ॥ २ ॥
śrī-balir uvāca
yady uttamaśloka bhavān mameritaṁ
vaco vyalīkaṁ sura-varya manyate
karomy ṛtaṁ tan na bhavet pralambhanaṁ
padaṁ tṛtīyaṁ kuru śīrṣṇi me nijam
Bali Mahārāja said: O best Personality of Godhead, most worshipable for all the demigods, if You think that my promise has become false, I shall certainly rectify matters to make it truthful. I cannot allow my promise to be false. Please, therefore, place Your third lotus footstep on my head.
Read Śrīla Prabhupāda's purport on Vedabase.io