'Heaven' in the Bible

For the Messiah did not enter a sanctuary made with hands (only a model of the true one) but into heaven itself, so that He might now appear in the presence of God for us.

Therefore from one man—in fact, from one as good as dead—came offspring as numerous as the stars of heaven and as innumerable as the grains of sand by the seashore.

to the assembly of the firstborn whose names have been written in heaven, to God who is the Judge of all, to the spirits of righteous people made perfect,

Make sure that you do not reject the One who speaks. For if they did not escape when they rejected Him who warned them on earth, even less will we if we turn away from Him who warns us from heaven.

His voice shook the earth at that time, but now He has promised, Yet once more I will shake not only the earth but also heaven.