After the meal, the angel Michoel asked Avrohom, "Where is Sarah?"
"She is in her tent," said Avrohom. Sarah was modest and she wouldn't feel right going out in front of strangers.
"Well, please give her a message. Tell Sarah that one year from now, she will have a son!"
Sara had been listening from inside her tent, and when she heard this news, she laughed to herself. "I'm too old to have a baby, and so is Avrohom!" she thought. (Of course, she didn't know that their guests were actually messengers of HaShem!)
After the angels went on their way, HaShem spoke to Avrohom. Why had Sarah laughed? HaShem wanted to know. Did she think that giving her a son would be too hard for HaShem to do? After all, HaShem created the whole world.
With the good news delivered, Michoel's mission was accomplished. He flew back to HaShem, leaving Gavriel and Rafael to continue on their journey.
