2:40  

नेहाभिक्रमनाशोऽस्ति प्रत्यवायो न विद्यते ।
स्वल्पमप्यस्य धर्मस्य त्रायते महतो भयात् ॥२- ४०॥

nehaabhikramanaasho'sti pratyawaayo na widyate ।

swalpamapyasya dharmasya traayate mahato bhayaat ॥२- ४०॥

Source: Automatic ITRANS Transliteration

In this, there is no setback of progress, reversal of course is not to be found.
Even a small amount of this doctrine defends from great fear.

Source: Milind S. Pandit

In Karma-yoga no effort is ever lost, and there is no harm. Even a little practice of this discipline protects one from great fear (of birth and death).

Source: The Bhagavad-Gita: The Sacred Song

In this endeavor there is no loss or diminution, and a little advancement on this path can protect one from the most dangerous type of fear.

Source: Bhagavad Gita As It Is