Mahabharata 6.115.13

अयं पितरमाज्ञाय कामार्तं शंतनुं पुराऊर्ध्वरेतसमात्मानं चकार पुरुषर्षभः

ayaṃ pitaramājñāya kāmārtaṃ śaṃtanuṃ purāūrdhvaretasamātmānaṃ cakāra puruṣarṣabhaḥ

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