|Canto 8: Withdrawal of the Cosmic Creations||Chapter 19: Lord Vāmanadeva Begs Charity from Bali Mahārāja|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 8.19.38
atrāpi bahvṛcair gītaḿ
śṛṇu me 'sura-sattama
satyam om iti yat proktaḿ
yan nety āhānṛtaḿ hi tat
atra api — in this regard also (in deciding what is truth and what is not truth); bahu-ṛcaiḥ — by the śruti-mantras known as Bahvṛca-śruti, which are evidence from the Vedas; gītam — what has been spoken; śṛṇu — just hear; me — from me; asura-sattama — O best of the asuras; satyam — the truth is; om iti — preceded by the word oḿ; yat — that which; proktam — has been spoken; yat — that which is; na — not preceded by oḿ; iti — thus; āha — it is said; anṛtam — untruth; hi — indeed; tat — that.
One might argue that since you have already promised, how can you refuse? O best of the demons, just take from me the evidence of the Bahvṛca-śruti, which says that a promise is truthful preceded by the word oḿ and untruthful if not.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness