BG 4.2

एवं परम्पराप्राप्तमिमं राजर्षयो विदुः। स कालेनेह महता योगो नष्टः परन्तप।।4.2।।

evaṁ paramparā-prāptam imaṁ rājarṣhayo viduḥ sa kāleneha mahatā yogo naṣhṭaḥ parantapa

evam—thus; paramparā—in a continuous tradition; prāptam—received; imam—this (science); rāja-ṛiṣhayaḥ—the saintly kings; viduḥ—understood; saḥ—that; kālena—with the long passage of time; iha—in this world; mahatā—great; yogaḥ—the science of Yog; naṣhṭaḥ—lost; parantapa—Arjun, the scorcher of foes

Translation

This, handed down in regular succession by the royal sages, was known. This Yoga, however, has been lost here over time, O Parantapa (burner of the foes).

Commentary

4.2 एवम् thus? परम्पराप्राप्तम् handed down in regular succession? इमम् this? राजर्षयः the royal sages? विदुः knew? सः this? कालेन by lapse of time? इह here? महता by long? योगः Yoga? नष्टः destroyed? परन्तप O Parantapa.Commentary The royal sages Men who were kings and at the same time sages also? learnt this Yoga.Arjuna could burn or harass his foes? like the sun? by the heat of his valour and power. Hence the name Parantapa.