וַיְהִ֗י בִּ֠בְרֹחַ אֶבְיָתָ֧ר בֶּן־אֲחִימֶ֛לֶךְ אֶל־דָּוִ֖ד קְעִילָ֑ה אֵפ֖וֹד יָרַ֥ד בְּיָדֽוֹ׃
And it came to pass, when Abiathar the son of Ahimelech fled to David to Keilah, that he came down with an ephod in his hand.
Read kabbalistic (mystical) interpretation of I Samuel 23:6: and classical mystical sources.