Abiathar.

2 Samuel 8:17
Zadok son of Ahitub and Ahimelech son of Abiathar were priests; Seraiah was the scribe;

1 Chronicles 18:16
Zadok son of Ahitub and Ahimelech son of Abiathar were priests; Shavsha was the scribe;

1 Kings 2:26
Then the king said to Abiathar the priest, "Go back to your fields in Anathoth. Even though you deserve to die, I will not put you to death at this time, since you carried the ark of the Lord GOD before my father David, and you suffered through all that my father suffered."

1 Kings 2:27
So Solomon banished Abiathar from the priesthood of the LORD and so fulfilled the word the LORD had spoken at Shiloh against the house of Eli.

1 Samuel 22:20-22
But one of the sons of Ahimelech son of Ahitub escaped. His name was Abiathar, and he fled to David. . . .

1 Samuel 23:6, 9
(Now Abiathar son of Ahimelech had brought the ephod with him when he fled to David at Keilah.) . . .

2 Samuel 8:17
Zadok son of Ahitub and Ahimelech son of Abiathar were priests; Seraiah was the scribe;

2 Samuel 15:24, 29, 35
Zadok was also there, and all the Levites with him were carrying the ark of the covenant of God. And they set down the ark of God, and Abiathar offered sacrifices until the people had finished passing out of the city. . . .

2 Samuel 20:25
Sheva was the scribe; Zadok and Abiathar were priests;

1 Kings 1:7
So Adonijah conferred with Joab son of Zeruiah and with Abiathar the priest, who supported him.

1 Kings 2:22, 26, 27
King Solomon answered his mother, "Why do you request Abishag the Shunammite for Adonijah? Since he is my older brother, you might as well request the kingdom for him and for Abiathar the priest and for Joab son of Zeruiah." . . .

1 Kings 4:4
Benaiah son of Jehoiada was in charge of the army; Zadok and Abiathar were priests;

which is not lawful.

Exodus 29:32, 33
At the entrance to the Tent of Meeting, Aaron and his sons are to eat the meat of the ram and the bread that is in the basket. . . .

Leviticus 24:5-9
You are also to take fine flour and bake twelve loaves, using two-tenths of an ephah for each loaf, . . .