'House of Israel' in the Bible

But go rather to the lost sheep of the house of Israel.

But he answered and said, I am not sent but unto the lost sheep of the house of Israel.

Therefore let all the house of Israel know assuredly, that God has made that same Jesus, whom you have crucified, both Lord and Christ.

Then God turned, and gave them up to worship the host of heaven; as it is written in the book of the prophets, O you house of Israel, have you offered to me slain beasts and sacrifices by the space of forty years in the wilderness?

For finding fault with them, he says, Behold, the days come, says the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:

For this is the covenant that I will make with the house of Israel after those days, says the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people: