Genesis 15:13

Four hundred years - "Which began," says Mr. Ainsworth, "when Ishmael, son of Hagar, mocked and persecuted Isaac, Genesis 21:9 ; Galatians 4:29 ; which fell out thirty years after the promise, Genesis 12:3 ; which promise was four hundred and thirty years before the law, Galatians 3:17 ; and four hundred and thirty years after that promise came Israel out of Egypt, Exodus 12:41 ."