What does Hebrews 11:17 mean?

When Abraham was tested, he trusted God so much that he was willing to offer up Isaac, his own son—the one he’d been promised. He was ready to give up the very thing he’d waited his whole life for. Hebrews 11:17 - Modern Text Bible

(Abraham’s faith was proven by his willingness to surrender what mattered most, believing God could still keep His promises.)