Gabriel comes to tell the priest Zechariah he will have a child that will have to be named, John. Zechariah questioned him by asking if he isnt to old to have a child and because of that he was unable to speak until his future child John was born.
The Birth of John the Baptist
After Elizabeth was alone for about 5 months she went back to her husband. Before that an angle appeared and told Mary that she was going to be soon filled with the Holy Spirit.
Mary visits Elizabeth and her husband. When she gets thereElizabeth filled with the Holy spirit and her baby leaped in her womb.
At last, John was finally born. All the neighbors and friends where very happt and excited for his Birth but they where all wondering what the name would be.
Zechariah one day recieved the Holy Spirit like his wife. He was finally able to speak but he demonstated that he did believe and followed what God ordered him to do which was name his son John and so thats why he was abl to speak again.
And like they they lived a happy life and gave birth to someone ewho ended up baptizing Jesus and if your wondering why he was not able to speak its because when his friends where asking if its true what Elizabeth said that their child would be named John and he followed Gods orders and told everyone that it was true.