(12) In the future, as a consequence of your heeding these laws, and your guarding and fulfilling them; Adonoy, your God, will guard for you the covenant and the kindliness that He swore to your forefathers. [Metsudah Publications, 2009]

Now it shall be:

because of your hearkening to these regulations, by keeping and observing [them],

that YHWH will keep for you the covenant of loyalty that he swore to your fathers;

[Everett Fox]

In the future, as a consequence of [in exchange for] your heeding these laws, and your guarding and fulfilling them; Adonoy, your God, will guard for you the covenant and the kindliness that He swore to your forefathers.

והיה עקב תשמעון AND THE CONSEQUENCE WILL BE, IF YE HEARKEN (The Hebrew text may be taken to signify if you will hear the heel, עקב) — If, even the lighter commands which a person usually treads on with his heels (i.e. which a person is inclined to treat lightly), ye will hearken to,

BECAUSE. Ekev (because) has the same meaning as ekev (reward) in For ever, reward (Ps. 119:112).

I am resolved to follow Your laws
to the utmost [Meaning of Heb. uncertain.]

forever.

AND IT SHALL COME TO PASS ‘EIKEV’ YE HEARKEN. Eikev means “because.” So also, ‘eikev’ (because) that Abraham hearkened to My voice. And Rashi wrote: “If you will hearken even to the lighter commandments which a person usually treads upon with his ‘heels’ [i.e., those commandments which a person is inclined to treat lightly] then G-d will keep His promise to you.” ...
And the commentators have said that the meaning of the word eikev is that “in the end” there will be reward. Similarly, in keeping them [the ordinances of G-d] ‘eikev rav’ (there is [in the end] great reward). The verse here is thus stating: “and the end [the ultimate consequence] of your hearkening to the ordinances and your observing them is that G-d shall keep the covenant and the mercy, and He will love thee. ”

This is correct, for in the Sacred Language the beginning of anything is called rosh [literally: “head”], as it is said, ‘rosh’ (the beginning of) Thy word is truth. So also is the leader of the generation called “the head of the people,” and the best of spices is called rosh.

Similarly, the conclusion of any matter is called akeiv (heel) as the Sacred Language adopts these figurative expressions from the human body; and thus “the head” is the beginning while “the heel” is the conclusion and end of the body.

Scripture also speaks of the head and the tail [with reference to people], figuratively using the body of the animal.

And Onkelos rendered the word eikev as chalaf (“in exchange for”), like ‘cheilef’ (in return for) your service. Onkelos thus made it an expression of “roundabout” [the end result of a series of events], derived from the verse, and ‘he’akov(the crooked) shall be made straight — that is, the circuitous road which goes roundabout [will become a straight, level path].

So also ‘akubah’ of blood means “it is surrounded and encircled” [with blood]. The verse here is thus stating [according to Onkelos]: “and it shall come to pass that the effect caused by your hearkening to the ordinances and your performing them will be that G-d will keep His covenant with you.” He has explained it well. A similar expression is ‘biglal’ (for the sake of) this thing which means “on account of,” from the word ‘v’gal’lu’ (and they roll) the stone. Similarly it is my opinion that every expression of akeivah is a term denoting “circle” or “circuit.” Thus: ‘akov haleiv’ (the heart is deceitful); ‘vaya’akveini’ (and he hath gotten the better of me) these two times; but Jehu did it ‘b’akbah’ (in subtlety) — all these being expressions of “rolling” and “circling.” Therefore they called Jacob “Jeshurun” [from the root yashar (straight and upright)] because the opposite of “the deceitful one” is he who is “upright” [as indicated by the name “Jeshurun”]. Similarly, the end-part of the foot, called akeiv — as it is said, and his hand seizing ‘ba’akeiv (the heel) of Esau — is so called because of its roundness, just as the [Sacred] Language calls the middle part [palm and sole] of the hand and foot kapoth, because of their being shaped like golden kapoth (spoons). This usage [of the term akeiv] is common in the [Sacred] Language, just as the Rabbis have said in the Sifre: “At His right hand was a fiery law unto them. When the word came forth from the mouth of the Holy One, blessed be He, it would go by way of the right hand of the Holy One to the left of Israel, v’okeiv (and it encircled) the camp of Israel twelve miles by twelve miles.” So also is the expression: “they come upon him ba’akifin,” meaning “with circuitous and subtle arguments,” like the word akeivin as these two letters [the veth and the fei] were considered by the Sages to be interchangeable, as I have already explained. ...

AND ABRAM PASSED THROUGH THE LAND. I will tell you a principle by which you will understand all the coming portions of Scripture concerning Abraham, Isaac, and Jacob. It is indeed a great matter which our Rabbis mentioned briefly, saying: “Whatever has happened to the patriarchs is a sign to the children.” It is for this reason that the verses narrate at great length the account of the journeys of the patriarchs, the digging of the wells, and other events. ... It is for this reason that the Holy One, blessed be He, caused Abraham to take possession of the Land and symbolically did to him all that was destined to happen in the future to his children. Understand this principle.