'Myriads' in the Bible

Then he said, "Yahweh came from Sinai, and he dawned upon them from Seir; he shone forth from Mount Paran, and he came with myriads of holy ones, at his right hand a fiery law for them.

[As] the firstborn of his ox, majesty {belongs to him}, and his horns [are] [the] horns of a wild ox; with them he drives people together, and they [are] the myriads of Ephraim, and they [are] the thousands of Manasseh."

I write for him myriads of my instruction; they are regarded as a strange thing.

Will Yahweh be pleased with thousands of rams, with myriads of rivers of oil? Shall I give my firstborn for my transgression, the fruit of my body [for the] sin of my soul?