Bg 18.23

niyatam sanga-rahitam
araga-dvesatah krtam
aphala-prepsuna karma
yat tat sattvikam ucyate

Word for word: 
niyatam — regulated; sanga-rahitam — without attachment; araga-dvesatah — without love or hatred; krtam — done; aphala-prepsuna — by one without desire for fruitive result; karma — action; yat — which; tat — that; sattvikam — in the mode of goodness; ucyate — is called.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
That action which is regulated and which is performed without attachment, without love or hatred, and without desire for fruitive results is said to be in the mode of goodness.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Regulated occupational duties, as prescribed in the scriptures in terms of the different orders and divisions of society, performed without attachment or proprietary rights and therefore without any love or hatred, and performed in Krishnaconsciousness for the satisfaction of the Supreme, without self-satisfaction or self-gratification, are called actions in the mode of goodness.