'Sky' in the Bible

But in truth I tell you, there were many widows in Israel in Elijah's days, when the sky was shut up three and a half years, and there was a great famine over all the land.

Jesus said to him, "Foxes have dens and the birds in the sky have nests, but the Son of Man has no place to lay his head."

You hypocrites! You know how to interpret the appearance of the earth and the sky, but how can you not know how to interpret the present time?

For just like the lightning flashes and lights up the sky from one side to the other, so will the Son of Man be in his day.