From which culture does the myth that the first human was sweated from a giant's armpit originate?

A primeval frost giant of Norse * mythology, Ymir was formed at the beginning of creation from rivers of ice that flowed from Niflheim, the land of mist, into Ginnungagap, the yawning emptiness. Ymir emerged from the ice as it melted from the heat of Muspelheim, the fire kingdom that lay near these two regions.

As the evil Ymir slept, other frost giants formed from the sweat of his body. The first male and female emerged from his left armpit, and another man came from his legs. Ymir drank milk from a primeval cow, which in turn licked blocks of ice and released a man called Buri. Buri's grandsons were the gods Odin*, Vili, and Ve. These three gods eventually attacked Ymir while he slept and killed him. As Ymir's blood gushed from his body, it caused a flood that drowned all the frost giants except Bergelmir and his wife. They escaped in a ship and founded a new race of beings.