6 And he believed in the LORD, and He accounted it to him for
righteousness. 7 Then He said to him, “I am the LORD, who brought you out of Ur of the Chaldeans, to give you this land to inherit it.” 8 And he said, “Lord GOD, how shall I know that I will inherit it?” 9 So He said to him, “Bring Me a three-year-old heifer, a three-year-old female goat, a three-year-old ram, a turtledove, and a young pigeon.” 10 Then he brought all these to Him and cut them in two, down the middle, and placed each piece opposite the other; but he did not cut the birds in two. 11 And when the vultures came down on the carcasses, Abram drove them away. 12 Now when the sun was going down, a deep sleep fell upon Abram; and behold, horror and great darkness fell upon him. 13 Then He said to Abram: “Know certainly that your descendants will be strangers in a land that is not theirs, and will serve them, and they will afflict them four hundred years. 14 And also the nation whom they serve I will judge; afterward they shall come out with great possessions. 15 Now as for you, you shall go to your fathers in peace; you shall be buried at a good old age. 16 But in the fourth generation they shall return here, for the iniquity of the Amorites is not yet complete.”
We can notice that the deal was not as trivial as some may have portrayed the incident to be. Abraham believed God and then he followed with a question ---"hang on, Lord how do I know this to be true"? What about us, do we have questions for God?
It has been said by those who have gone before that in the Christian's lifetime, he/she will encounter the same question, he/she will encounter the doubting of his/her salvation - "Lord how do I know your promise of heaven is true"? Good for you if you have never entertained doubts since you first believed but some older Christians I have met have been honest enough to confess that they have wondered a few times.
So when that happens, does God do the same and asks us to bring a heifer? Do we have an heifer incident we can look into, wherein God solemnly swears to us his promise is true? Where does God make us look?
I think we do have something similar but it is not a heifer. It is simple bread and wine along with the words of Jesus at the Supper. Just as surely as I can touch, see and taste that bread and wine at the Lord's Supper, with the words - "this is my body broken for you" we are sure that his promise is true. Why? Because we did not invent this institution of the Lord's Supper, it was Jesus who instituted this. You hear the words, they are outside you and they come to you - a sinner broken by sin, it comes as a gift, not asked for, but initiated by God the same way he initiated his covenanat when Abraham wondered. It is one sided, you do nothing. You simply trust it. It is done to you, you do nothing, the same way Abraham fell asleeep. We note the heifer was not symbolic, it was an actual heifer, once alive, now slaughtered cut in two.
We have something better than the blood and flesh of a heifer, we got the very body and blood of Jesus - God's Son, Saviour. That is, if you believe it is not mere bread, and not mere wine. Because if you don't, then it stops short of being what Jesus says it is... the his body broken, blood spilled... for your sins. Selah