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Zera Yisrael (Hebrew: זרע ישראל, lit. 'Seed [of] Israel'), known also as Zera Kadosh (lit.'Seed [of] Holiness') is a legal category in Halakha that denotes the blood descendants of Jews who, for one reason or another, are not legally Jewish according to religious criteria.[1][2][3] This is usually due to a lack of matrilineal Jewish ancestry.[4]