'God of Heaven' in the Bible

Now it came about when I heard these words, I sat down and wept and mourned for days; and I was fasting and praying [constantly] before the God of heaven.

And I said, “Please, O Lord God of heaven, the great and awesome God, who keeps the covenant and lovingkindness for those who love Him and keep His commandments,

The king said to me, “What do you request?” So I prayed to the God of heaven.

I answered them, “The God of heaven [has appointed us for His purpose and] will give us success; therefore we His servants will arise and build, but you have no portion, right, or memorial in Jerusalem.”