यत्करोषि यदश्नासि यज्जुहोषि ददासि यत्। यत्तपस्यसि कौन्तेय तत्कुरुष्व मदर्पणम् ॥

yat karoṣhi yad aśhnāsi yaj juhoṣhi dadāsi yat yat tapasyasi kaunteya tat kuruṣhva mad-arpaṇam

Whatsoever thou doest, whatsoever thou eatest, whatsoever thou offerest, whatsoever thou givest, whatsoever thou doest of austerity, O Kaunteya, do thou that as an offering unto Me.

In plain words: Krishna tells Arjuna to make everything he does an offering to God. This includes working, eating, worshipping, giving to others and self-discipline.