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SB 10.90.41
tisrah kotyah sahasranam
astasiti-satani ca
asan yadu-kulacaryah
kumaranam iti srutam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
I have heard from authoritative sources that the Yadu family employed 38,800,000 teachers just to educate their children.