3:28  

तत्त्ववित्तु महाबाहो गुणकर्मविभागयोः ।
गुणा गुणेषु वर्तन्त इति मत्वा न सज्जते ॥३- २८॥

tattwawittu mahaabaaho guNakarmawibhaagayoH ।

guNaa guNeShu wartanta iti matwaa na sajjate ॥३- २८॥

Source: Automatic ITRANS Transliteration

But knowers of reality, O great-armed one, [are] distinguishers of qualities from actions.
Qualities operate on qualities: so believing, they are not attached.

But those who know what is real, O great-armed one, distinguish qualities from actions. By assuming qualities operate on qualities, they avoid attachment.

Source: Milind S. Pandit

The one who knows the truth, O Arjuna, about the role of Guna and action does not get attached to the work, knowing that it is the Gunas that work with their instruments, the organs.

Source: The Bhagavad-Gita: The Sacred Song

One who is in knowledge of the Absolute Truth, O mighty-armed, does not engage himself in the senses and sense gratification, knowing well the differences between work in devotion and work for fruitive results.

Source: Bhagavad Gita As It Is