Uddhava thus served the Lord continually from childhood, and in his old age that attitude of service never slackened. As soon as he was asked about the message of the Lord, he at once remembered all about Him.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स कथं सेवया तस्य कालेन जरसं गतः । पृष्टो वार्तां प्रतिब्रूयाद्भर्तुः पादावनुस्मरन्
sa kathaṃ sevayā tasya kālena jarasaṃ gataḥ | pṛṣṭo vārtāṃ pratibrūyādbhartuḥ pādāvanusmaran
SB 3.2.3