Look! There are days coming, is the utterance of Jehovah, and I will conclude with the house of Israel and with the house of Judah a new covenant;
not one like the covenant that I concluded with their forefathers in the day of my taking hold of their hand to bring them forth out of the land of Egypt, which covenant of mine they themselves broke, although I myself had husbandly ownership of them, is the utterance of Jehovah.
For this is the covenant that I shall conclude with the house of Israel after those days, is the utterance of Jehovah. I will put my law within them, and in their heart I shall write it. And I will become their God, and they themselves will become my people (Jeremiah 31:31-33).

We have looked at the literal meaning of this in section [11]. But every scripture has a further fulfillment, a greater symbolic meaning. In the symbolic meaning, we have a repetition of the making of a covenant with a house. So applying the Successive Repeated Action Principle, we know that there are two greater new covenants made between God and a house. The phrase:

I will conclude a new covenant with the house of Israel and with the house of Judah

Means two greater new covenants will be concluded, one with a greater house of Israel and one with a greater house of Judah. It’s two further new covenants with two further houses in addition to the new covenant itself. One of these is the newer covenant with the house of Israel of verse 33, which we have seen from the literal meaning, which we have called the second new covenant. So we have a further new covenant with the house of Judah. We will call this the third new covenant for now.

But equally there is a further fulfillment to the newer covenant, the second new covenant of verse 33:

This is the covenant that I shall conclude with the house of Israel (Jeremiah 33).

I will put my laws in their mind, and in their hearts I shall write them. And I will become their God, and they themselves will become my people (Hebrews 8:10).

Notice that there are no obligations of the people of the house of Israel in this covenant. We have a repetition of laws being inculcated and we see that he will be their God and they will be his people. But if they are to be his people then obviously he is to be their God. So we have a repetition of God making a group of people his. So we have a second covenant, with a second set of laws over a second set of people. In other words there is a second newer covenant with yet another house of Israel which we will call the 4th new covenant. Both groups have new laws from God which are written in their hearts and minds.

So we have found 4 new covenants! The new covenant that we all know and love (Sarah) with both houses, the second new covenant (Keturah as wife), with the house of Israel, the 3rd new covenant with a greater house of Judah and the 4th new covenant (Keturah as slave) with a greater house of Israel. We have already seen this from the symbolism of Jacob's wives - see [11].

Genesis 30 tells us that first there were 4 sons from Leah, then there were 2 sons from Bilhah (Rachel’s maid), then there were two sons from Zilpah (Leah’s maid) then there were two more sons from Leah, then there was a daughter from Leah, Dinah, then there were two sons from Rachel (Joseph and later Benjamin). So we have two wives and two slave women and 12 sons.

Jacob is standing for Jesus, Leah is the new covenant, she gave birth first, Rachel is the 2nd new covenant, the covenant of Keturah, for she was a wife (and a concubine initially, when she was Bilhah), she gives birth last. Bilhah was the slave of Rachel (the newer covenant) therefore she is the 4th new covenant. Zilpah was the slave of Leah (the new covenant) therefore she is the 3rd new covenant. In fact the order of covenants was 1 3 4 2 in this terminology. But since the modern Christian is only aware of one new covenant, it makes sense to call the current new covenant the second. The other two, the slaves, then have to be the 3rd and 4th.