Out of the four sampradayas, namely Brahma-sampradaya, Sri-sampradaya, Kumara-sampradaya and Rudra-sampradaya, the disciplic succession of spiritual master to disciple known as the Kumara-sampradaya is coming down from the four Kumaras

Expressions researched:
"Out of the four sampradāyas, namely Brahma-sampradāya, Śrī-sampradāya, Kumāra-sampradāya and Rudra-sampradāya, the disciplic succession of spiritual master to disciple known as the Kumāra-sampradāya is coming down from the four Kumāras"

Srimad-Bhagavatam

SB Canto 4

The four Kumāras are paramparā spiritual masters of the Vaiṣṇava sampradāya. Out of the four sampradāyas, namely Brahma-sampradāya, Śrī-sampradāya, Kumāra-sampradāya and Rudra-sampradāya, the disciplic succession of spiritual master to disciple known as the Kumāra-sampradāya is coming down from the four Kumāras. So Pṛthu Mahārāja was very respectful to the sampradāya-ācāryas.

SB 4.22.4, Translation and Purport

When the great sages accepted their reception, according to the instructions of the śāstras, and finally took their seats offered by the King, the King, influenced by the glories of the sages, immediately bowed down. Thus he worshiped the four Kumāras.

The four Kumāras are paramparā spiritual masters of the Vaiṣṇava sampradāya. Out of the four sampradāyas, namely Brahma-sampradāya, Śrī-sampradāya, Kumāra-sampradāya and Rudra-sampradāya, the disciplic succession of spiritual master to disciple known as the Kumāra-sampradāya is coming down from the four Kumāras. So Pṛthu Mahārāja was very respectful to the sampradāya-ācāryas. As it is said by Śrīla Viśvanātha Cakravartī Ṭhākura, sākṣād-dharitvena samasta-śāstraiḥ: a spiritual master, or the paramparā-ācārya, should be respected exactly like the Supreme Personality of Godhead. The word vidhivat is significant in this verse. This means that Pṛthu Mahārāja also strictly followed the injunctions of the śāstra in receiving a spiritual master, or ācārya, of the transcendental disciplic succession. Whenever an ācārya is seen, one should immediately bow down before him. Pṛthu Mahārāja did this properly; therefore the words used here are praśrayānata-kandharaḥ. Out of humility, he bowed down before the Kumāras.