Mahabharata 3.186.13

मार्कण्डेय उवाच · mārkaṇḍeya uvāca

हन्त ते कथयिष्यामि नमस्कृत्वा स्वयम्भुवेपुरुषाय पुराणाय शाश्वतायाव्ययाय च

hanta te kathayiṣyāmi namaskṛtvā svayambhuvepuruṣāya purāṇāya śāśvatāyāvyayāya ca

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