Verses with the word week in the Old Testament (3 verses):

Genesis 29:27
Fulfil her week, and we will give thee this also for the service which thou shalt serve with me yet seven other years.

Genesis 29:28
And Jacob did so, and fulfilled her week: and he gave him Rachel his daughter to wife also.

Daniel 9:27
And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.