'Firstling' in the Bible

Every firstling that is born among thy kine and among thy sheep that is a male, thou shalt hallow to Jehovah thy God: thou shalt do no work with the firstling of thy kine, nor shear the firstling of thy sheep.

His majesty is as the firstling of his ox; And his horns are as the horns of a buffalo. With them shall he push the peoples Together to the ends of the earth. These are the myriads of Ephraim, And these are the thousands of Manasseh.