כָּל־בְּנֵי־פֶ֕רֶץ הַיֹּשְׁבִ֖ים בִּירוּשָׁלִָ֑ם אַרְבַּ֥ע מֵא֛וֹת שִׁשִּׁ֥ים וּשְׁמֹנָ֖ה אַנְשֵׁי־חָֽיִל׃ (ס)
All the sons of Perez that dwelt in Jerusalem were four hundred threescore and eight valiant men.
Read kabbalistic (mystical) interpretation of Nehemiah 11:6: and classical mystical sources.