Śānti-parva Adhyāya 30: Nārada–Parvata Samaya-bhaṅga, Śāpa, and the Marriage of Sukumārī
तौ तथेति प्रतिज्ञाय महर्षी लोकपूजितौ
tau tatheti pratijñāya maharṣī lokapūjitau
লোকপূজিত সেই দুজন মহর্ষিয়ে “তথাস্তु” বুলি কৈ প্ৰতিজ্ঞা কৰিলে।
श्रीकृष्ण उवाच
The verse highlights the ethical weight of a pledge (pratijñā): assent is not casual speech but a binding commitment, especially when made by revered authorities such as sages, whose conduct models dharma for society.
Two respected great sages respond “tathā iti” (“so be it”) and formally undertake a promise, indicating their agreement to proceed according to the discussed course of action.