Although these four great sages were older than Brahmā’s other sons like Marīci, they appeared like small naked children only five or six years old. When Jaya and Vijaya saw them trying to enter Vaikuṇṭhaloka, these two gatekeepers, thinking them ordinary children, forbade them to enter.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अशपन् कुपिता एवं युवां वासं न चार्हथः । रजस्तमोभ्यां रहिते पादमूले मधुद्विषः । पापिष्ठामासुरीं योनिं बालिशौ यातमाश्वतः
aśapan kupitā evaṃ yuvāṃ vāsaṃ na cārhathaḥ | rajastamobhyāṃ rahite pādamūle madhudviṣaḥ | pāpiṣṭhāmāsurīṃ yoniṃ bāliśau yātamāśvataḥ
SB 7.1.37