Bhagavad Gita 2.30
देही नित्यमवध्योऽयं देहे सर्वस्य भारत।
तस्मात्सर्वाणि भूतानि न त्वं शोचितुमर्हसि।।2.30।।
Dehi nityamavadhyoyam dehe sarvasya bharata
Tasmatsarvani bhutani na tvam shochitumarhasi
Simple meaning, written by AIThe body is always bound, this body is a bondage for everyone, therefore you should not mourn all beings.