The expression do not be afraid
is a popular expression especially in connection with angelic appearances. We have it here in Luke 1:13 and also in Luke 1:30 (see also Matthew 1:20; Matthew 14:27; Matthew 28:10; Luke 2:10; Luke 5:10; Luke 8:50; Luke 12:32; and many more references). The angel announces that Zechariah and Elizabeth will have a son in their old age. His name is to be John
meaning, The Lord is gracious.
13 Mais l'ange lui dit: Ne crains point, Zacharie; car ta prière a été exaucée. Ta femme Elisabeth t'enfantera un fils, et tu lui donneras le nom de Jean.