This, the Indweller in the body of everyone, is ever indestructible, O Arjuna; therefore, thou shouldst not grieve for any creature.
English translation: Swami Sivananda (1942) · word meanings below from the same source. Source
2.30 देही indweller? नित्यम् always? अवध्यः indestructible? अयम् this? देहे in the body? सर्वस्य of all? भारत O Bharata? तस्मात् therefore? सर्वाणि (for) all? भूतानि creatures? न not? त्वम् thou? शोचितुम् to grieve? अर्हसि (thou) shouldst.Commentary The body of any creature may be destroyed but the Self cannot be killed. Therefore you should not grieve regarding any creature whatever? Bhishma or anybody else.
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2.30 देही indweller? नित्यम् always? अवध्यः indestructible? अयम् this? देहे in the body? सर्वस्य of all? भारत O Bharata? तस्मात् therefore? सर्वाणि (for) all? भूतानि creatures? न not? त्वम् thou? शोचितुम् to grieve? अर्हसि (thou) shouldst.Commentary The body of any creature may be destroyed but the Self cannot be killed. Therefore you should not grieve regarding any creature whatever? Bhishma or anybody else.