1 Samuel 23:6

6. When Abiathar… fled to David to Keilah This does not refer to the time when Abiathar first fled to David from Nob, but to a subsequent flight from the wilderness of Judah to Keilah, after David and his men had taken possession of that city. This verse is not out of its proper place, as Houbigant supposes, but is inserted here to prepare the reader for what immediately follows. When David went forth to defend the inhabitants of Keilah, Abiathar remained in the wilderness until he heard that Saul was making preparations to besiege David and his men at Keilah; then he hastened down thither with the ephod in his hand. By means of this ephod David received communications from Jehovah which enabled him to make a timely escape from Keilah.