Punarjanma (Rebirth)

The creation and destruction of the worlds is repetitive!

आब्रह्मभुवनाल्लोकाः पुनरावर्तिनोऽर्जुन ।
मामुपेत्य तु कौन्तेय पुनर्जन्म न विद्यते ॥८:१६॥

Lord Krishna says to Arjun:
The worlds (lokas) and/or the peoples from up to the Brahma's world, keep returning again, O Arjun. But having approached me, O son of Kunti, there is no rebirth.

Purified souls enjoy heavenly pleasures alongside the gods.

त्रैविद्या मां सोमपाः पूतपापा
यज्ञैरिष्ट्वा स्वर्गतिं प्रार्थयन्ते ।
ते पुण्यमासाद्य सुरेन्द्रलोकम्
अश्नन्ति दिव्यान्दिवि देवभोगान् ॥९:२०॥

Lord Krishna says to Arjun:
They who are the drinkers of the nectar, cleansing the sins with sacrifices according to three Vedas, praying me wishing for own fate, with the obtainable piety, enjoy heavenly pleasures alongside the gods, in the world of the god's king.

Having expended the good deeds in the heaven, they fall back to the mortal world.

ते तं भुक्त्वा स्वर्गलोकं विशालं
क्षीणे पुण्ये मर्त्यलोकं विशन्ति ।
एवं त्रयीधर्ममनुप्रपन्ना
गतागतं कामकामा लभन्ते ॥९:२१॥

Lord Krishna says to Arjun:
They, having enjoyed the vast world of the heaven, having expended the good deeds, fall back to the mortal world. Thus, conforming to the righteousness described in the three Vedas, the going and coming is what the desirers of the enjoyment obtain.

You and I have gone several rebirths. I remember them all, you don't know any.

बहूनि मे व्यतीतानि जन्मानि तव चार्जुन ।
तान्यहं वेद सर्वाणि न त्वं वेत्थ परन्तप ॥४:५॥

Lord Krishna says to Arjun:
The profuse god said: a lot of births of you and a lot of births of mine have passed. O Arjun. I know them all but you do not know, O pain of the enemy.

He who knows my birth and actions are divine, they don't undergo rebirth.

जन्म कर्म च मे दिव्यमेवं यो वेत्ति तत्वत​: ।
त्यक्त्वा देहं पुनर्जन्म नैति मामेति सोऽर्जुनः ॥४:९॥

Lord Krishna says to Arjun:
Thus, who knows intrinsically that my births and actions are divine, O Arjun, having abandoned the body does not undergo rebirth, but arrives me, the supersoul.