Mahabharata 12.261.58

इदं तु दुष्करं कर्म कुटुम्बमभिसंश्रितम्दानमध्ययनं यज्ञः प्रजासंतानमार्जवम्

idaṃ tu duṣkaraṃ karma kuṭumbamabhisaṃśritamdānamadhyayanaṃ yajñaḥ prajāsaṃtānamārjavam

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