B.G 2.23
nainaṁ chindanti śastrāṇi nainaṁ dahati pāvakaḥ। na cainaṁ kledayantyāpo na śoṣayati mārutaḥ ॥ 2-23॥
Weapons cannot cut Him, fire cannot burn Him, water cannot drench Him, not even wind can dry Him.
Gīta Bhāshya 2.23
Both natural causes and particular special causes cannot affect the Lord.
svataḥ prāyonimittaiśca avināśino'pi kenacinnimitta viśeṣeṇa syāt। kakacchedavat ityato viśeṣanimittāni niṣedhati– 'nainam' iti ॥ 23 ॥
Though indestructible by itself and not affected by natural causes, can it be affected by specific causes? The idea of specific causes is negated in the verse 'nainam', i.e. not this, by giving examples like cutting with a saw, etc.
Gīta Tātparya 2.23
Various external causes cannot destroy or alter the Lord.
kāraṇatopi na īśvarasya anyathātvamityāha - nainaṃ chindantīti ॥23॥
Even from the standpoint of (external) cause, there is no change in the Supreme Being; thus it is said - 'nainam chindanti', i.e. not possible to pierce, and so on.
