'Ancestor' in the Bible

"Yahweh will bring on you and on your people and on the house of your ancestor days that have not come since [the] day Ephraim departed from Judah: the king of Assyria."

“Go and tell Hezekiah that this is what the Lord God of your ancestor David says: I have heard your prayer; I have seen your tears. Look, I am going to add 15 years to your life.

Your first ancestor sinned, and your mediators rebelled against me.

then you will take delight in the LORD, and he will make you ride upon the heights of the earth; and he will make you feast on the inheritance of your ancestor Jacob, your father. "Yes! The mouth of the LORD has spoken."

For [most certainly] You are our Father, even though Abraham [our ancestor] does not know usAnd Israel does not acknowledge us.You, O Lord, are [still] our Father,Our Redeemer from everlasting is Your name.