Ex 3:20-4:1
after which they'll be glad to send you off. 21 I'll see to it that this people get a hearty send-off by the Egyptians — when you leave, you won't leave empty-handed! 22 Each woman will ask her neighbor and any guests in her house for objects of silver and gold, for jewelry and extra clothes; you'll put them on your sons and daughters. Oh, you'll clean the Egyptians out!"

God told Moses this and it happened just as He said!