Because it is so, therefore,
यत्करोषि यदश्नासि यज्जुहोषि ददासि यत् ।
यत्तपस्यसि कौन्तेय तत्कुरुष्व मदर्पणम् ॥ २७ ॥
yatkaroṣi yadaśnāsi yajjuhoṣi dadāsi yat .
yattapasyasi kaunteya tatkuruṣva madarpaṇam .. 27 ..
Whatever thou doest, whatever thou eatest, whatever thou sacrificest, whatever thou givest, in whatever austerity thou engagest, do it as an offering to Me.
Read the commentary
Whatever thou doest of thy own accord (i.e., not enjoined in the sastra) and whatever thou offerest in sacrifice as enjoined in the sruti or the smriti, whatever thou givest—such things as gold—to the brahmanas and others,……do all that as an offering to Me.
Now listen as to what will accrue to you doing thus :