The sacrifice of Issac on Mount Moriah is symbolizing the sacrifice of Christ depicted as a Lamb.At the bottom of the window we can see Isaac carrying wood as Christ carrying his cross. "Some time later God tested Abraham. He said to him, ?Abraham!? /.../ Take your son, your only son, whom you love?Isaac?and go to the region of Moriah. Sacrifice him there as a burnt offering on a mountain I will show you.? (Genesis 22, 1-2)