Matthew Poole and continuators on Genesis 22:6

6 And Abraham took the wood of the burntoffering, and laid it upon Isaac his son , and he took the fire in his hand, and a knife; and they went both of them together.

Who though called a lad, ver. 5. was now a grown man, at least five and twenty years old, and therefore well able to bear that burden, and in this act he was an eminent Type of Christ, who carried that wood upon which he was Crucifyed.