niscayam shrinu me tatra
tyago hi purusha-vyaghra
O best of the Bharatas, now hear My judgment about renunciation. O tiger among men, renunciation is declared in the scriptures to be of three kinds.
Commentary by Srila Prabhupada
Although there are differences of opinion about renunciation, here the Supreme Personality of Godhead, Sri Krishna, gives His judgment, which should be taken as final. After all, the Vedas are different laws given by the Lord. Here the Lord is personally present, and His word should be taken as final. The Lord says that the process of renunciation should be considered in terms of the modes of material nature in which they are performed.
Commentary by Sri Visvanatha Cakravarti Thakur
In this verse the Lord states his opinion. Tyaga has three types: in sattva, rajas and tamas. Omitting to describe these three types till verse seven, and then starting with a description of tyaga in the mode of tamas, from the use of the word sannyasa in describing tamasic tyaga in that verse, it is understood that tyaga and sannyasa have the same meaning in the opinion of the Lord.