The Great Epic of the Bhārata dynasty 1.183.9

1.183.9

bhadraṃ vo'stu nihitaṃ yadguhāyāṃ vivardhadhvaṃ jvalana ivedhyamānaḥ |
mā vo vidyuḥ pārthivāḥ kecaneha yāsyāvahe śibirāyaiva tāvat |
so'nujñātaḥ pāṇḍavenāvyayaśrīḥ prāyācchīghraṃ baladevena sārdham || 9 ||

[paragraph continues] And the son of Rohini (Valadeva) also approaching Yudhishthira, did the same. And the Pandavas, beholding Krishna and Valadeva, began to express great delight. And, O thou foremost of the Bharata race, those heroes of the Yadu race thereafter touched also the feet of Kunti, their father's sister. And Ajatasatru, that foremost of the Kuru race, beholding Krishna, enquired after his well-being and asked, 'How, O Vasudeva, hast thou been able to trace us, as we are living in disguise?' And Vasudeva, smilingly answered, 'O king, fire, even if it is covered, can be known. Who else among men than the Pandavas could exhibit such might? Ye resisters of all foes, ye sons of Pandu, by sheer good fortune have ye escaped from that fierce fire. And it is by sheer good fortune alone that the wicked son of Dhritarashtra and his counsellors have not succeeded in accomplishing their wishes. Blest be ye! And grow ye in prosperity like a fire in a cave gradually growing and spreading itself all around. And lest any of the monarchs recognise ye, let us return to our tent.' Then, obtaining Yudhishthira's leave, Krishna of prosperity knowing no decrease, accompanied by Valadeva, hastily went away from the potter's abode.'"