Mahabharata 2.61.63

यदि वै वक्ष्यसि मृषा प्रह्लादाथ न वक्ष्यसिशतधा ते शिरो वज्री वज्रेण प्रहरिष्यति

yadi vai vakṣyasi mṛṣā prahlādātha na vakṣyasiśatadhā te śiro vajrī vajreṇa prahariṣyati

Our plain-language meaning of this verse is waiting for scholar review.