BG 2.38
सुखदुःखे समे कृत्वा लाभालाभौ जयाजयौ। ततो युद्धाय युज्यस्व नैवं पापमवाप्स्यसि
sukha-duḥkhe same kṛitvā lābhālābhau jayājayau tato yuddhāya yujyasva naivaṁ pāpam avāpsyasi
Look upon pleasure and pain, victory and defeat, with an equal eye. Be prepared for the combat, and you will commit no sin.
Translated by Shri Purohit Swami
Having made pleasure and pain, gain and loss, victory and defeat equal, engage in battle for the sake of battle; thus, you shall not incur sin.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
sukha—happiness; duḥkhe—in distress; same kṛitvā—treating alike; lābha-alābhau—gain and loss; jaya-ajayau—victory and defeat; tataḥ—thereafter; yuddhāya—for fighting; yujyasva—engage; na—never; evam—thus; pāpam—sin; avāpsyasi—shall incur