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SB 10.57.26

uvāsa tasyāṁ katicin
 mithilāyāṁ samā vibhuḥ
mānitaḥ prīti-yuktena
 janakena mahātmanā
tato ’śikṣad gadāṁ kāle
 dhārtarāṣṭraḥ suyodhanaḥ
Synonyms: 
uvāsa — He lived; tasyām — there; katicit — several; mithilāyām — in Mithila; samāḥ — years; vibhuḥ — the almighty Lord, Śrī Balarāma; mānitaḥ — honored; prīti-yuktena — affectionate; janakena — by King Janaka (Videha); mahā-ātmanā — the great soul; tataḥ — then; aśikṣat — learned; gadām — the club; kāle — in time; dhārtarāṣṭraḥ — the son of Dhṛtarāṣṭra; suyodhanaḥ — Duryodhana.
Translation: 
The almighty Lord Balarāma stayed in Mithilā for several years, honored by His affectionate devotee Janaka Mahārāja. During that time Dhṛtarāṣṭra’s son Duryodhana learned from Balarāma the art of fighting with a club.