And there were in the same country shepherds abiding in the field keeping watch over their flock by night. And lo, the angel of the Lord came upon them, and the glory of the Lord shone round about them, and they were sore afraid. And then the angel said unto them, Fear not: for behold, I bring you good tidings of great joy, which shall be to all people. For unto you is born this day in the city of David a Savior, which is Christ the Lord. And this shall be a sign unto you: Ye shall find the babe wrapped in swaddling clothes, lying in a manger. And suddenly there was with the angel a multitude of the heavenly host, praising God and saying, Glory to God in the highest, and on earth, peace, good will toward men.
And it came to pass, as the angels were gone away from them into heaven, the shepherds said one to another, Let us now go even unto Bethlehem, and see this thing which is come to pass, which the Lord hath made known to us. And they came with haste, and found Mary, Joseph, and the babe lying in a manger. And when they had seen it, they made known abroad the saying which was told them concerning this child. And all they that heard it wondered at those things which were told them by the shepherds. But Mary kept all these things, and pondered them in her heart.
And the shepherds returned, glorifying and praising God for all the things that they had heard and seen, as it was told unto them.
Isaiah 9:2-4. 6-7 (KJV)
The people that walked in darkness have seen a great light: they that dwell in the land of the shadow of death, upon them hath the light shined. Thou hast multiplied the nation, and not increased the joy: they joy before thee according to the joy in harvest, and as men rejoice when they divide the spoil. For thou hast broken the yoke of his burden, and the staff of his shoulder, the rod of his oppressor, as in the day of Midian. [...] For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counselor, the mighty God, the everlasting Father, the Prince of Peace. Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the Lord of hosts will perform this.