'Firstling' in the Bible

All the firstling males that are born of thy herd and of thy flock thou shalt sanctify unto Jehovah thy God: thou shalt do no work with the firstling of thy herd, nor shear the firstling of thy flock.

The firstling of his herd, majesty is his; And his horns are the horns of the wild-ox: With them he shall push the peoples all of them, even the ends of the earth: And they are the ten thousands of Ephraim, And they are the thousands of Manasseh.