Exodus 28:9-12   Take two onyx stones and engrave on them the names of the sons of Israel in the orderof their birth—six names on one stone and the remaining six on the other. Engrave the names of the sons of Israel on the two stones the way a gem cutter engraves a seal. Then mount the stones in gold filigree settings and fasten them on the shoulder pieces of the ephod as memorial stones for the sons of Israel. Aaron is to bear the names on his shoulders as a memorial before the Lord.

Judges 17:5 Now this man Micah had a shrine, and he made an ephod and some household gods and installed one of his sons as his priest.

Judges 18:18-20 Now When the five men went into Micah’s house and took the idol, the ephod and thehousehold gods, the priest said to them, “What are you doing?”

They answered him, “Be quiet! Don’t say a word. Come with us, and be our father and priest. Isn’t it better that you serve a tribe and clan in Israel as priest rather than just one man’s household?” The priest was very pleased. He took the ephod, the household gods and the idol and went along with the people.

I Samual 23:9-11 When David learned that Saul was plotting against him, he said to Abiathar the priest, “Bring the ephod.” David said, “Lord, God of Israel, your servant has heard definitely that Saul plans to come to Keilah and destroy the town on account of me. Will the citizens of Keilah surrender me to him? Will Saul come down, as your servant has heard? Lord, God of Israel, tell your servant.”

And the Lord said, “He will.”

Again David asked, “Will the citizens of Keilah surrender me and my men to Saul?” And the Lord said, “They will.”

I Samual 30:7-8 Then David said to Abiathar the priest, the son of Ahimelek, “Bring me the ephod.”Abiathar brought it to him, and David inquired of the Lord, “Shall I pursue this raiding party? Will I overtake them?”

“Pursue them,” he answered. “You will certainly overtake them and succeed in the rescue.”