Just as the fruits and flowers of a tree in due course of time undergo six changes — birth, existence, growth, transformation, dwindling and then death — the material body, which is obtained by the spirit soul under different circumstances, undergoes similar changes. However, there are no such changes for the spirit soul.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
जन्माद्याः षडिमे भावा दृष्टा देहस्य नात्मनः । फलानामिव वृक्षस्य कालेनेश्वरमूर्तिना
janmādyāḥ ṣaḍime bhāvā dṛṣṭā dehasya nātmanaḥ | phalānāmiva vṛkṣasya kāleneśvaramūrtinā
SB 7.7.18