וּמִן־בְּנֵ֣י אֶפְרַ֔יִם עֶשְׂרִ֥ים אֶ֖לֶף וּשְׁמוֹנֶ֣ה מֵא֑וֹת גִּבּ֣וֹרֵי חַ֔יִל אַנְשֵׁ֥י שֵׁמ֖וֹת לְבֵ֥ית אֲבוֹתָֽם׃ (ס)
And of the children of Ephraim twenty thousand and eight hundred, mighty men of valour, famous men in their fathers’houses.
Read midrashic interpretation of I Chronicles 12:31: and classical rabbinic exegesis.