Mahabharata 12.294.9

मूत्रोत्सर्गे पुरीषे च भोजने च नराधिपत्रिकालं नाभियुञ्जीत शेषं युञ्जीत तत्परः

mūtrotsarge purīṣe ca bhojane ca narādhipatrikālaṃ nābhiyuñjīta śeṣaṃ yuñjīta tatparaḥ

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