'Heaven' in the Bible

I tell you that the pay of the labourers who have gathered in your crops--pay which you are keeping back--is calling out against you; and the outcries of those who have been your reapers have entered into the ears of the Lord of the armies of Heaven.

But above all things, my brethren, do not swear, either by Heaven or by the earth, or with any other oath. Let your 'yes' be simply 'yes,' and your 'no' be simply 'no;' that you may not come under condemnation.