How can I be sure?

When God made His promise to Abraham, since there was no one greater for Him to swear by, He swore by Himself, saying, "I will surely bless you and give you many descendants."

And so after waiting patiently, Abraham received what was promised.

Men swear by someone greater than themselves, and the oath confirms what is said and puts an end to all argument.

Because God wanted to make the unchanging nature of His purpose very clear to the heirs of what was promised, He confirmed it with an oath.

God did this so that, by two unchanging things in which it is impossible for God to lie, we who have fled to take hold of the hope offered to us may be great encouraged.
                                     -- Hebrews 6:13-18

What are the "two unchanging things" the writer of Hebrews is talking about?

The two unchanging things are (1) the original promise (covenant) God made with Abraham, and (2) the oath He made later to confirm it.

The story is told in Genesis 15.

The word of the LORD came to Abram in a vision:
     'Do not be afraid, Abram.
     I am your shield, your very great reward.

     '....Look up at the heavens and count the starts -- if indeed you
     can count them...so shall your offspring be.

     Abram believed the LORD, and he credited it to him as
     righteousness.

     ....I am the LORD, who brought you out of Ur of the Chaldeans
     to give you this land to take possession of it.'


But Abram questions God about the land:



     'O Sovereign LORD, how can I know that I will gain possession
     of it?'



This is such an astonishing glimpse of the Sovereign God, LORD Creator of the Universe, speaking to one of His small creatures.

But He doesn't speak to Abram in a condescending way, as if he were small and insignificant (most astonishing is that He would speak to him at all, if
you think about it).

Instead God takes Abram's question seriously.


"How can I know for sure?" Abram asks.


"Well, Abram, you foolish man," I might say. "God just told you what He was going to do...how can you
question Him?"

But Gold decides to swear to Abram, in an oath-confirming ceremony, just what He had promised.

It was a common, accepted ceremony performed in those days between people making business arrangements.

They would take sacrificial animals, cut them in two parts, and both parties would walk between the pieces, reciting the terms of the agreement.

This would make it binding, as if we went to the Court House and had our signatures on a contract verified by a Notary.

Perhaps one man was selling land to another man, and the buyer was going to pay in cattle.

The two men would walk between the pieces of the animal, reciting the terms to each other. When the ceremony was completed it was sworn testimony to their agreement.

In the book of Jeremiah there is another reference to one of these ceremonies.

So instead of being angry at Abram for his doubt, we see a gracious and kind God patiently dealing with Abram in human terms that he would understand.

And why did God do this act of mercy?

The writer of Hebrews tell us in the passage above: (1) to make His promise and purpose very clear
and (2) to encourage us.

Read about it in Genesis, the first book of the Old Testament, chapter 15.

What does Abram do during the ceremony? Does he walk between the pieces with God?

No. Abram falls into a deep sleep and God walks alone through the ceremony.

Why? Because Abram had nothing to bring to the agreement. He wasn't paying anything. He was the recipient of all the blessings.

So God walked alone and confirmed His everlasting covenant with Abram and Abram rested and received it all.

It's called grace.

And it is pictured again at Calvary, when God the Son
confirmed His oath to mankind, and suffered alone.

We, like Abram, have nothing to bring to the table.

We are only recipients of the benefits of the oath.

Jesus performed the ceremony alone.