Mahabharata 12.68.17

मातरं पितरं वृद्धमाचार्यमतिथिं गुरुम्क्लिश्नीयुरपि हिंस्युर्वा यदि राजा न पालयेत्

mātaraṃ pitaraṃ vṛddhamācāryamatithiṃ gurumkliśnīyurapi hiṃsyurvā yadi rājā na pālayet

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