Mahabharata 15.22.12

आयसं हृदयं नूनं मन्दाया मम पुत्रकयत्सूर्यजमपश्यन्त्याः शतधा न विदीर्यते

āyasaṃ hṛdayaṃ nūnaṃ mandāyā mama putrakayatsūryajamapaśyantyāḥ śatadhā na vidīryate

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