The head of every man is Christ, and the head of the woman is man

1 Corinthians 11:1-16

But I want you to realize that the head of every man is Christ, and the head of the woman is man, and the head of Christ is God.

For if a woman does not cover her head, she might as well have her hair cut off; but if it is a disgrace for a woman to have her hair cut off or her head shaved, then she should cover her head.

A man ought not to cover his head, since he is the image and glory of God; but woman is the glory of man. For man did not come from woman, but woman from man; neither was man created for woman, but woman for man.  It is for this reason that a woman ought to have authority over her own[c] head, because of the angels. 

Does not the very nature of things teach you that if a man has long hair, it is a disgrace to him, but that if a woman has long hair, it is her glory? For long hair is given to her as a covering. If anyone wants to be contentious about this, we have no other practice—nor do the churches of God.

Some of the women in the church at Corinth have flouted custom by praying bareheaded. What is the proper dress for men and women when they pray and prophesy in the church? Sine Jewish customs differed from those of the Greeks and Romans. Paul needs to give a ruling.

The men, he says, should pray bareheaded, but women should cover their heads. A covered head is the symbol of authority given to women by God. This is a difficult passage and the meaning is not wholly clear. In the end, Paul falls back on what is customary in the churches.

Why?

Pray to the Lord we should have proper dressing including the head of man and woman. 

The head of man is Christ and the head of the woman is man, and the head of Christ is God. So praying to the Lord, a man ought not to cover his head.

A man has long hair, it is a disgrace to him, but if a woman has long hair, it is her glory. Long hair is given to her as a covering.

Not only for the teaching of Paul, but also it is good to rule to pray before the Lord.

How?

We have freedom after be a Christian, but this freedom is not indulgent, but honor the Lord our head.