After Sarah laughed at the promise of a son, what did the LORD ask Abraham?

Answer: "Is anything too hard for the LORD?"

The LORD asked, "Is anything too difficult for the LORD?" (KJV: "too hard") and repeated that Sarah would have a son.

“And the LORD asked Abraham, “Why did Sarah laugh and say, ‘Can I really bear a child when I am old?’”— Genesis 18:13 (BSB)