From the Holy Communion Epistle:

He had to become like his brothers and sisters in every respect, so that he might be a merciful and faithful high priest in the service of God, to make a sacrifice of atonement for the sins of the people. Because he himself was tested by what he suffered, he is able to help those who are being tested.
(Letter to the Hebrews, Chapter 2, verses 17-18, NRSV)

Glass in the Abbey church of St. Gildas des Bois, Loire Atlantique, France