וַיֹּ֤אמֶר אֵלָיו֙ שָׁא֔וּל בֶּן־מִ֥י אַתָּ֖ה הַנָּ֑עַר וַיֹּ֣אמֶר דָּוִ֔ד בֶּֽן־עַבְדְּךָ֥ יִשַׁ֖י בֵּ֥ית הַלַּחְמִֽי׃
And Saul said to him: ‘Whose son art thou, thou young man?’ And David answered: ‘I am the son of thy servant Jesse the Beth-lehemite.’
Read midrashic interpretation of I Samuel 17:58: and classical rabbinic exegesis.