|Easton's Bible Dictionary|
The observance of birth-days was common in early times (Job 1:4, 13, 18). They were specially celebrated in the land of Egypt (Genesis 40:20). There is no recorded instance in Scripture of the celebration of birth-days among the Jews. On the occasion of Herod's birth-day John the Baptist was beheaded (Matthew 14:6).
Birth-day (2 Occurrences)
Matthew 14:6 But when Herod's birth-day was kept, the daughter of Herodias danced before them, and pleased Herod. (WBS)
Mark 6:21 And when a convenient day had come, that Herod on his birth-day made a supper to his lords, high captains, and chief men of Galilee; (WBS)