John 6:47

6:47 I tell you the solemn truth, the one who believes has eternal life.

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 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.