Luke 1:58

If you carefully observe, you will find that the word signifying fulness is no where used except at the birth of the righteous. Hence it is said, Now Elisabeth's full time came. For the life of the righteous hath fulness, but the days of the wicked are empty. For the bringing forth of saints causes the rejoicing of many; it is a common blessing; for justice is a public virtue, and therefore at the birth of a just man a sign of his future life is sent beforehand, and the grace of the virtue which is to follow is represented, being foreshadowed by the rejoicing of the neighbours.

And for that reason the Lord kept back the delivery of Elisabeth, that her joy might be increased, and her fame the greater. Hence it follows, And her neighbours and cousins heard, &c. For they who had known her barrenness were made the witnesses of the Divine grace, and no one seeing the child departed in silence, but gave praise to God, Who had vouchsafed him beyond their expectation.

(Metaphrastes.) For it is the custom for virgins to go away when the pregnant woman brings forth. But when she reached her own home, she went to no other place, but abode there until she knew the time of her delivery was at hand. And Joseph doubting, is instructed by an Angel.