So he put Ephraim ahead of Manasseh.

 Genesis 48:1-22

“Now then, your two sons born to you in Egypt before I came to you here will be reckoned as mine; Ephraim and Manasseh will be mine, just as Reuben and Simeon are mine. Any children born to you after them will be yours; in the territory they inherit they will be reckoned under the names of their brothers. As I was returning from Paddan, to my sorrow Rachel died in the land of Canaan while we were still on the way, a little distance from Ephrath. So I buried her there beside the road to Ephrath” (that is, Bethlehem).

Israel said to Joseph, “I never expected to see your face again, and now God has allowed me to see your children too.”

But Israel reached out his right hand and put it on Ephraim’s head, though he was the younger, and crossing his arms, he put his left hand on Manasseh’s head, even though Manasseh was the firstborn.

Then he blessed Joseph and said, “May the God before whom my fathers Abraham and Isaac walked faithfully, the God who has been my shepherd all my life to this day, the Angel who has delivered me from all harm —may he bless these boys. May they be called by my name and the names of my fathers Abraham and Isaac, and may they increase greatly on the earth.”

Nevertheless, his younger brother will be greater than he, and his descendants will become a group of nations.” He blessed them that day and said, In your name will Israel pronounce this blessing:

    ‘May God make you like Ephraim and Manasseh’”

Why?

Blessing is important before the Lord! Even under the blessing of elder people. Israel could not see but he knew who will be greater among tow brothers.

How?

The way of the Lord is beyond our way, so under the blessing of the Lord is higher than any others.