Observed unbroken, difficult brahmacarya
'Cakara duscaram brahma brahmacaryam akhanditam' (SB 1.3.6; Wikisource patha reads 'cacara').
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Kumaras (the four celibate boy-sages)
कुमार
Also known as कौमारं सर्गम् · Kaumara-sarga (the Kumara creation)
The Four Kumaras — Sanaka, Sanatana, Sanandana and Sanat-kumara — are Brahma's mind-born sons who remained celibate boys and became first teachers of the path of knowledge and devotion; symbols of dispassionate wisdom in Hindu tradition. SB 1.3.6 names the Lord's first assumed form 'kaumaram sargam', the Kumara creation, which observed unbroken brahmacarya; identification with the four boy-sages is the unanimous tradition.
Śrīmad Bhāgavata Mahāpurāṇa 1.3.6 — Sanskrit Wikisource (pinned oldid=369178)
Kumaras (the four celibate boy-sages) — avatara of — Krishna
The Lord, 'as the first divinity, assumed the Kumara creation': 'sa eva prathamam devah kaumaram sargam asritah' (SB 1.3.6); the Kumara creation = the four celibate boy-sages per the unanimous traditional reading. Evidence: assumption EXPLICIT; identity STRONG_CONTEXT.