Madhvacharya's Dvaita Vedanta and translation of Sarvamoola containing Bhagavad Gita, Upanishads, and Brahmasutra.

Bhagavad Gīta Tātparya

वासांसि जीर्णानि यथा विहाय नवानि गृह्णाति नरोऽपराणि। तथा शरीराणि विहाय जीर्णान्यन्यानि संयाति नवानि देही ॥ २-२२॥

vāsāṁsi jīrṇāni yathā vihāya navāni gr̥hṇāti narō'parāṇi। tathā śarīrāṇi vihāya jīrṇānyanyāni saṁyāti navāni dēhī ॥ 2-22॥

Just as a person casts off worn-out clothes and puts on new ones, similarly the being gives up worn-out bodies and takes up other bodies that are new.

Gīta Tātparya 2.22

Union and separation of the body from the soul is birth and death, respectively. There is no need to grieve for the same.

Even jīva has union and separation with the body in the form of birth and death. The verse 'vāsāṁsīti' clarifies that it should not be the reason to grieve.

बहुचित्रजगद्बहुधाकरणात् परशक्तिरनन्तगुणः परमः ।
सुखरूपममुष्य पदं परमं स्मरतस्तु भविष्यति तत्सततम् ॥
"The one who has created this variegated vast universe with varied forms has infinite power and is of infinite auspicious qualities. He certainly bestows the highest state of bliss to those who meditate on his ever happy essence." -Dwādasha stōtra 4.3

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