According to Hebrews 11, what did Abraham believe God would do if Isaac was slain as a sacrifice?

Abraham believed that God could raise Isaac from the dead or more specifically that he could raise the Dead

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.