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 3:5

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 5:24-25

5:24 “I tell you the solemn truth, the one who hears my message and believes the one who sent me has eternal life and will not be condemned, but has crossed over from death to life. 5:25 I tell you the solemn truth, a time is coming – and is now here – when the dead will hear the voice of the Son of God, and those who hear will live.

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 6:32

6:32 Then Jesus told them, “I tell you the solemn truth, it is not Moses who has given you the bread from heaven, but my Father is giving you the true bread from heaven.

John 6:53

6:53 Jesus said to them, “I tell you the solemn truth, unless you eat the flesh of the Son of Man and drink his blood, you have no life in yourselves.

John 12:24

12:24 I tell you the solemn truth, unless a kernel of wheat falls into the ground and dies, it remains by itself alone. But if it dies, it produces much grain.

John 14:12

14:12 I tell you the solemn truth, the person who believes in me will perform the miraculous deeds that I am doing, and will perform greater deeds than these, because I am going to the Father.

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.

John 16:23

16:23 At that time you will ask me nothing. I tell you the solemn truth, whatever you ask the Father in my name he will give you.

John 21:18

21:18 I tell you the solemn truth, when you were young, you tied your clothes around you and went wherever you wanted, but when you are old, you will stretch out your hands, and others will tie you up and bring you where you do not want to go.”