Exodus 1:13-14

1:13 And the Egyptians made the children of Israel to serve with rigour: 1:14 And they made their lives bitter with hard bondage, in morter, and in brick, and in all manner of service in the field: all their service, wherein they made them serve, [was] with rigour.

Exodus 2:23

2:23 And it came to pass in process of time, that the king of Egypt died: and the children of Israel sighed by reason of the bondage, and they cried, and their cry came up unto God by reason of the bondage.