Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Karma Yoga Chapter 3, Verse 3.19.
Sanskrit
तस्मादसक्तः सततं कार्यं कर्म समाचर । असक्तो ह्याचरन्कर्म परमाप्नोति पूरुषः ॥ ३.१९ ॥
Hindi
इसलिये तू निरन्तर आसक्तिसे रहित होकर सदा कर्तव्यकर्मको भलीभाँति करता रह क्योंकि आसक्तिसे रहित होकर कर्म करता हुआ मनुष्य परमात्माको प्राप्त हो जाता है|
English
Therefore, Arjuna always perform your given duties without feelings of attachment towards any being or anything. A person doing unattached actions, or in other words, “inction” attains the Lord, the key to perfection.