One verse

Bhagavad Gita 2.38

2.38

सुखदुःखे समे कृत्वा लाभालाभौ जयाजयौ | ततो युद्धाय युज्यस्व नैवं पापमवाप्स्यसि ||२-३८||

sukhaduḥkhe same kṛtvā lābhālābhau jayājayau . tato yuddhāya yujyasva naivaṃ pāpamavāpsyasi ||2-38||

sukha
happiness
duḥkhe
and distress
same
in equanimity
kṛtvā
doing so
lābha-alābhau
both profit and loss
jaya-ajayau
both victory and defeat
tataḥ
thereafter
yuddhāya
for the sake of fighting
yujyasva
engage (fight)
na
never
evam
in this way
pāpam
sinful reaction
avāpsyasi
you will gain

Do thou fight for the sake of fighting, without considering happiness or distress, loss or gain, victory or defeat – and by so doing you shall never incur sin.