One answer:
Tribe of Levi. See genealogy in 1 Chronicles 6.
Another thought:
He was a Kohathite. His family lived among the Ephraimites. For proof,see the following: 1Samuel:1:1-28 "...Now there was a certain man of Ramathaim-zophim, of mount Ephraim, and his name was Elkanah, the son of Jeroham, the son of Elihu, the son of Tohu, the son of Zuph, an Ephrathite..."
Supporting Information:
Kohath was a descendant of Levi (1 Chronicles 6:1 ). As mentioned, Samuel's father, Elkanah, was indeed a Kohathite, which would then make him from the tribe of Levi. He was called an Ephrathite because he settled in the territory of Ephraim.(1Chronicles 6:19, 22-28, 33-38).
We cannot be sure but Samuel was born around 1105BCE. He was the last of the Judges.
Samuel was from Ramah in the territory of Ephraim (1 Samuel 1:1).
Primarily in 1 Samuel but also in 1 & 2 Chronicles, Psalm 99:6, Jeremiah 15:1, Acts 3:2; 13:20, and Hebrews 11:32.
Traditional chronology puts the birth of Samuel in the year 928 BCE. See also:
The Books of Samuel.
Eli was Samuel's teacher in the Bible.
1 Samuel ch.25.
2 Samuel....22.31
Samuel was a judge.
If you want to know the life story of Samuel you can read about his life in I Samuel and II Samuel in the Old Testament in the Bible.
What specific Samuel passage?
It is found in Samuel chapter 21 verse 2o.
The Bible. 1 & 2 Samuel would be a good bet.
There is no book called "Eli" in the Bible. But the priest Eli was mentioned in 1 Samuel and 2 Samuel.
You can find Ruth in the Book of Ruth, which is in the Old Testament of the Bible.
There is Hannah, you can find her story in Samuel. Then there is Esther you can find her story in Esther. Then there are some of Jesus' friends in the Bible who followed him in Mark, Luke, and John. (you can check Mattthew but i am not sure.)