Arjuna said, O mighty-armed one, I wish to understand the purpose of renunciation [tyāga] and of the renounced order of life [sannyāsa], O killer of the Keśī demon, Hṛṣīkeśa.
The Supreme Lord said, To give up the results of all activities is called renunciation [tyāga] by the wise. And that state is called the renounced order of life [sannyāsa] by great learned men.
Chapter 18, Verse 1-2