Horns were Used for Holding Oil
Source: TTT
1 Samuel 16:1
Now the LORD said to Samuel, “How long are you going to mourn for Saul, since I have rejected him as king over Israel? Fill your horn with oil and go. I am sending you to Jesse of Bethlehem, for I have selected from his sons a king for Myself.”
1 Kings 1:39
Zadok the priest took the horn of oil from the tabernacle and anointed Solomon. Then they blew the ram’s horn, and all the people proclaimed, “Long live King Solomon!”