John 1:51

1:51 He continued, “I tell all of you the solemn truth – you will see heaven opened and the angels of God ascending and descending on the Son of Man.”

John 3:3

3:3 Jesus replied, “I tell you the solemn truth, unless a person is born from above, he cannot see the kingdom of God.”

John 3:5

3:5 Jesus answered, “I tell you the solemn truth, unless a person is born of water and spirit, he cannot enter the kingdom of God.

John 6:26

6:26 Jesus replied, “I tell you the solemn truth, you are looking for me not because you saw miraculous signs, but because you ate all the loaves of bread you wanted.

John 10:1

Jesus as the Good Shepherd

10:1 “I tell you the solemn truth, the one who does not enter the sheepfold by the door, but climbs in some other way, is a thief and a robber.

John 10:41

10:41 Many came to him and began to say, “John performed no miraculous sign, but everything John said about this man was true!”

John 11:28

11:28 And when she had said this, Martha went and called her sister Mary, saying privately, “The Teacher is here and is asking for you.”

John 13:16

13:16 I tell you the solemn truth, the slave is not greater than his master, nor is the one who is sent as a messenger greater than the one who sent him.

John 13:20

13:20 I tell you the solemn truth, whoever accepts the one I send accepts me, and whoever accepts me accepts the one who sent me.”

John 13:38

13:38 Jesus answered, “Will you lay down your life for me? I tell you the solemn truth, the rooster will not crow until you have denied me three times!

John 16:20

16:20 I tell you the solemn truth, you will weep and wail, but the world will rejoice; you will be sad, but your sadness will turn into joy.