Śrīmad-Bhāgavatam 10.75.12
Blended reading (Sanskrit + English inline)
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yadu-sṛñjaya-kāmboja
—
the Yadus, Sṛñjayas and Kāmbojas
Triple compound listing three clans. The Yadus are Kṛṣṇa's own. Their presence inside Yudhiṣṭhira's army is sambandha made visible.
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kuru-kekaya-kośalāḥ
—
the Kurus, Kekayas and Kośalas
Three more clans. Kuru includes both Pāṇḍava and Kaurava lines — the kṣatra that will fight itself at Kurukṣetra is here united in procession.
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kampayantaḥ-bhuvam
—
making the earth tremble
Causative participle + accusative. The earth's tremor anticipates Bhū-devī's later petition for relief. Gauḍīyas read this physical detail as theological foreshadowing.
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yajamāna
—
the performer of the sacrifice
From √yaj. Yudhiṣṭhira's primary identity in this chapter is not 'emperor' but 'sacrificer' — one who offers, including offering his own emperorhood.
The kings are described. Kāmbhoja refers to King Sudakṣiṇa and others. Though many others were present, these are mentioned because of relationships of friendship, or because they increased the strength of the army, or they were the best.
When earth trembles under massed armies, ordinarily it is fear. Here it is celebration — the same force that will, in a few years, break the same earth in Mahābhārata war. Kṛṣṇa is using the festival to gather what He will later thin.
The Bhāgavatam states (and verse 39 of this very chapter will echo) that one of Kṛṣṇa's reasons for descending is to relieve the earth of her burden of arrogant kṣatriyas. The Rājasūya gathers all those armies in one place — Yadus, Sṛñjayas, Kāmbojas, Kurus, Kekayas, Kośalas.
The celebration is also a census. Gauḍīyas read the chapter with both eyes open: Yudhiṣṭhira's joy is real; Kṛṣṇa's larger plan is also real.
My note
Source: vedabase.io