It's ok to kill certain people

Yahweh says you can kill a "sorceress" (Ex.22:18), a poor slob who screws animals (Ex.22:19), people with different religions (22:20), and people who attack or curse their parents (Ex. 21:17).  If you have sex with an unmarried virgin you just have to pay her dowry, if you don't marry her.  Israelites who  desecrate the Sabbath or who do any work on the Sabbath day are to be put to death. (Ex. 31:14-16)

Giving the first-born of sons, cattle and sheep is again mentioned in Ex. 22:29-30.  They should stay with their mothers seven days and on the eighth be given to Yahweh, which I'm guessing means hand them over to the priests for circumcision in the case of humans, and for sacrifice and the skimming of meat in the case of the animals. And because the Israelites are holy, they shouldn't eat carrion torn apart by wild animals.

Many passages in Genesis and Exodus entreat people to be kind to strangers, foreigners, widows and the fatherless.  These must have been vulnerable populations then, as they are now, only moreso.  The caveat is that these strangers have to abide by the rules of the Yahwehist society, including male circumcision, strict idol-free monotheism, and obeisance to the priestly caste.  Ex. 22:28 exhorts the people not to curse the ruler of their people, another attempt to keep the peace among a population clearly prone to complaining.

Laudably, there are also passages which tell people not to be unfair to their enemies.  I assume that this means other Yahwehists whom they happen not to like.  There are a lot of common sense "be nice, be fair" edicts. "Don't take bribes now, I will retaliate against your wickedness!"

Then Yahweh tells them that an angel will guide them to their promised land and that Yahweh will smite all their enemies.  Moses goes back up the mountain with Aaron and 70 elders and Moses gets the law from Yahweh, comes down and tells it to the people who accept it on the spot.  Moses then writes it all down. (Really? With what?  These are nomadic people.)

The covenant is confirmed with a creepy blood ritual involving young bull's blood being smeared on 12 pillars and sprinkled all over the people after Moses read them the book of the covenant.  Half of the blood was put in bowls for some reason.  Yuck.  The book of the covenant at that time probably wasn't as long as the present-day Pentatech (5 books of Moses), but I'm thinking it was the material from the Ten Commandments through the last laws in Exodus 23.

After the blood-fest, Moses, Aaron and 70 elders got to go up the mountain and for the first time actually see Yahweh himself, who was on a pavement of lapis lazuli, and party with him.  Then Yahweh asked Moses to go back up to the mountain yet again, so that Yahweh can give him tablets with the law (I thought Moses had already written them out) and this time Moses went alone with his "aide" Joshua.  They spent six days and nights up there and then there was a fire on top of the mountain, or the volcano erupted.  Moses then spent 40 days and 40 nights up there.

Where was Moses's wife all this time? Did she go back to Midian with her Dad or stay with Moses and the Israelites?  I forget.