The 3 times St John the Apostle closest to the Sacred Heart spoke in the Gospels

 38 And Jesus turning, and seeing them following him, saith to them: What seek you? Who said to him, Rabbi, (which is to say, being interpreted, Master,) where dwellest thou?  39 He saith to them: Come and see. They came, and saw where he abode, and they stayed with him that day: now it was about the tenth hour. 

John 1:38

 24 Simon Peter therefore beckoned to him, and said to him: Who is it of whom he speaketh?  25 He therefore, leaning on the breast of Jesus, saith to him: Lord, who is it? 26 Jesus answered: He it is to whom I shall reach bread dipped. And when he had dipped the bread, he gave it to Judas Iscariot, the son of Simon.  

John 13:25

 7 That disciple therefore whom Jesus loved, said to Peter: It is the Lord. Simon Peter, when he heard that it was the Lord, girt his coat about him, (for he was naked,) and cast himself into the sea.

John 21:7