Ramayana
रामस्य च सुता ये स्युस्तेषामायुः कियद्भवेत् । काम्यया भगवन्बूहि वंशस्यास्य गतिं मम ॥ 7-51-9 ॥
And of the sons who shall be born to Rama, how long shall their lifespan be? Of your goodwill, reverend one, tell me the course of this lineage of mine."
english translation