Buddhacarita by Ven Asvaghosa - Ancient Buddhist Texts

Buddha-carita, or Life of Buddha - 34
But all Bodhisattvas, those beings of pre-eminent nature, after
knowing the flavour of worldly enjoyments, have departed to the
forest as soon as a son is born to them; therefore he too, though he
had accomplished all his previous destiny, even when the (final)
motive had begun to germinate, still went on pursuing worldly
pleasure up to the time of attaining the supreme wisdom.
[Such is the second chapter in the great poem Śri Buddhacarita,
called Life in the Palace]