From the Byzantine Liturgy of the Feast of the Nativity
TROPARION, TONE IV
Your birth, O Christ our God, has shed upon the world the light of knowledge; for through it those who worshipped the stars have learned from a star to worship You, the Sun of Justice, and to recognize You as the Orient from on high, glory be to You, O Lord. (St. Stephen the Sabbait)
KONTAKION, TONE 3
Today the Virgin gives birth to perfect Essence, and the earth offers a cave to the Inaccessible; the angels sing His glory with the shepherds; the wise men journey with the star; for there is born to us an Infant Child, Eternal God. (St. Roman the Melodist)
CANON, ODE VII
O Christ, our Defender, taking the form of man, You have bestowed upon him (man) the joy of becoming Godlike! (St. John Damascene)