Śrīmad-Bhāgavatam · Text 4.22.12
Who is speaking and story frame
स्वागतं वो द्विजश्रेष्ठा यद्व्रतानि मुमुक्षव: ।
चरन्ति श्रद्धया धीरा बाला एव बृहन्ति च ॥ १२ ॥
svāgataṁ vo dvija-śreṣṭhā
yad-vratāni mumukṣavaḥ
caranti śraddhayā dhīrā
bālā eva bṛhanti ca
Mahārāja Pṛthu offered his welcome to the four Kumāras, addressing them as the best of the brāhmaṇas. He welcomed them, saying: From the beginning of your birth you strictly observed the vows of celibacy, and although you are experienced in the path of liberation, you are keeping yourselves just like small children.
Read Śrīla Prabhupāda's purport on Vedabase.io