Genesis 48:12-14

12Then Joseph took the boys [from his father’s embrace], and he bowed [before him] with his face to the ground.

13Then Joseph took them both, Ephraim with his right hand toward Israel’s left, and Manasseh with his left hand toward Israel’s right, and brought them close to him.

14But Israel reached out his right hand and laid it on the head of Ephraim, who was the younger, and his left hand on Manasseh’s head, crossing his hands [intentionally], even though Manasseh was the firstborn.