All Came to Pass

Not one of the good promises which the LORD had made to the house of Israel failed; all came to pass.

New American Standard Bible Jos 21:45.

This text is a testimony to the faithfulness of God. From this text, we can deduce that if God kept every promise he made to the house of Israel, he is also able to keep all the other promises he has made to the nations. He can also keep his promise about the return of Christ and about the glorification of his people and the establishment of his kingdom, of which there shall be no end.
Knowledge of that stated above should give great joy! It gives me great pleasure to know that my current condition and situation and status is not sufficient to change that which the Lord has decreed.
The promise to Abraham about the coming of his children to the land was before Isaac was born and between that time and the possession of the land, there was the sojourn in Egypt, the wandering in the wilderness, the community sins against God, the attacks from the inhabitants of the land. Many Israelites died in these events, and many families were wiped out as a result of these things, but it did not deter God from fulfilling his promise to Abraham.
The Lord is a great God, and He is indeed a good God.
As time goes by and we forget, and it begins to look like he has become slack concerning his promise, this shows us that is not the case. He is still working with his timeline, and at his appointed time, he will do that which he has promised.
So for those that think his commands are antiquated, they should not rejoice because as he has promised good and can deliver, he is also able and will reward the evil doers for their evil according to his word.