Bhagavad Gita Chapter 18.1
arjuna uvāca
sannyāsasya mahā-bāho
tattvam icchāmi veditum
tyāgasya ca hṛṣīkeśa
pṛthak keśi-niṣūdana
Translation
Arjuna said: O mighty-armed one, I wish to understand the purpose of renunciation [tyaga] and of the renounced order of life [sannyasa], O killer of the Keshi demon, master of the senses.