וּמְעוֹנֹתַ֖י הוֹלִ֣יד אֶת־עָפְרָ֑ה וּשְׂרָיָ֗ה הוֹלִ֤יד אֶת־יוֹאָב֙ אֲבִי֙ גֵּ֣יא חֲרָשִׁ֔ים כִּ֥י חֲרָשִׁ֖ים הָיֽוּ׃ (פ)
And Meonothai begot Ophrah; and Seraiah begot Joab the father of Ge-harashim; for they were craftsmen.
Read kabbalistic (mystical) interpretation of I Chronicles 4:14: and classical mystical sources.