'Generations' in the Bible

And God said, "This is the guarantee of the covenant I am making with you and every living creature with you, a covenant for all subsequent generations:

I will confirm my covenant as a perpetual covenant between me and you. It will extend to your descendants after you throughout their generations. I will be your God and the God of your descendants after you.

Then God said to Abraham, "As for you, you must keep the covenantal requirement I am imposing on you and your descendants after you throughout their generations.

Throughout your generations every male among you who is eight days old must be circumcised, whether born in your house or bought with money from any foreigner who is not one of your descendants.