Genesis 15:16

In the fourth generation your descendants will come back here, for the sin of the Amorites has not yet reached its full measure.'

(New International Version)

'Then in the fourth generation they will return here, for the iniquity of the Amorite is not yet complete.'

(New American Standard Bible)

But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full.

(King James Version)