John 8:28

So, Jesus said, "When you have lifted up the Son of man [i.e., to crucify Him], then you will know that I am [the Messiah] and that I do not do anything on my own authority, but I speak [only] those things that the Father has taught me.

John 3:14

And [just] like Moses lifted up the snake [on the pole] in the wilderness [Num. 21:9], so the Son of man must be lifted up [on the cross]

John 5:19

So, Jesus said to them, "Truly, truly, I tell you, the Son [of God] cannot do anything on His own [i.e., independently of the Father]; but [He does] what He sees His Father doing. For whatever the Father does, the Son also does as well.

John 5:30

"I cannot do anything by my own [authority]. I judge [people] based on what I hear [i.e., from the Father] and my judgment [of them] is just, because I do not look for what I want [to do], but for what He who sent me [i.e., God] wants.

John 3:11

Truly, truly, I tell you, we [i.e., Jesus and His disciples] speak about what we know, and testify about what we have seen, but you do not accept our testimony.

John 3:11-30

Truly, truly, I tell you, we [i.e., Jesus and His disciples] speak about what we know, and testify about what we have seen, but you do not accept our testimony.

Matthew 27:50-54

Then Jesus called out again with a loud voice and [finally] gave up His spirit [to God. See Luke 23:46].

John 6:38

For I have come down from heaven to do what God, who sent me, wants me to do, not what I want to do.

John 8:24

Therefore I said to you that you will die [condemned] in your sins. For unless you believe that I am [the Messiah, who came from above. See verse 23], you will die [condemned] in your sins."

John 11:42

I know that you always hear me, but I said this for the sake of the crowd standing here, so they would believe that you sent me."

John 12:32-34

And if I am lifted up from the earth [i.e., on the cross], I will draw [i.e., attract] all people to me."

John 12:49-50

For I did not speak from myself [i.e., on my own authority], but the Father Himself, who sent me, has ordered me what to say and speak.

John 16:10

[It will be shown] what is right because I am going [back] to the Father and you will not see me anymore.

John 19:18

There they crucified Him, along with two other men, one on each side with Jesus in the middle.

Acts 2:41

Then those who responded [by faith] to the words [spoken by Peter and the apostles] were immersed, and about three thousand persons were added to them [i.e., the apostles] on that day.

Acts 4:4

But many of the people who heard the message [of God] believed [in Jesus] and the number of men [alone] came to be about five thousand.

Romans 1:4

He was appointed to be the Son of God with power through the Spirit of holiness [Note: This could refer to the Holy Spirit] when He was raised from the dead.

1 Thessalonians 2:15-16

who killed the Lord Jesus and the [Old Testament] prophets and also drove us [apostles] out [of Thessalonica and Berea. See Acts 17]. They are not pleasing to God and are hostile to all people,

Hebrews 2:2-3

For if the message spoken through angels proved to be binding [Note: This is a reference to the law of Moses. See Acts 7:53; Gal. 3:19], and every violation [of it] and disobedience [to it] received a just penalty,

Treasury of Scripture Knowledge

Summary

Then said Jesus unto them, When ye have lifted up the Son of man, then shall ye know that I am he, and that I do nothing of myself; but as my Father hath taught me, I speak these things.

But

Bible References

When

John 3:14
And [just] like Moses lifted up the snake [on the pole] in the wilderness [Num. 21:9], so the Son of man must be lifted up [on the cross]
John 12:32
And if I am lifted up from the earth [i.e., on the cross], I will draw [i.e., attract] all people to me."
John 19:18
There they crucified Him, along with two other men, one on each side with Jesus in the middle.

Then

Matthew 27:50
Then Jesus called out again with a loud voice and [finally] gave up His spirit [to God. See Luke 23:46].
Acts 2:41
Then those who responded [by faith] to the words [spoken by Peter and the apostles] were immersed, and about three thousand persons were added to them [i.e., the apostles] on that day.
Acts 4:4
But many of the people who heard the message [of God] believed [in Jesus] and the number of men [alone] came to be about five thousand.
Romans 1:4
He was appointed to be the Son of God with power through the Spirit of holiness [Note: This could refer to the Holy Spirit] when He was raised from the dead.
1 Thessalonians 2:15
who killed the Lord Jesus and the [Old Testament] prophets and also drove us [apostles] out [of Thessalonica and Berea. See Acts 17]. They are not pleasing to God and are hostile to all people,

And that

John 5:19
So, Jesus said to them, "Truly, truly, I tell you, the Son [of God] cannot do anything on His own [i.e., independently of the Father]; but [He does] what He sees His Father doing. For whatever the Father does, the Son also does as well.
John 6:38
For I have come down from heaven to do what God, who sent me, wants me to do, not what I want to do.
John 11:42
I know that you always hear me, but I said this for the sake of the crowd standing here, so they would believe that you sent me."
John 12:49
For I did not speak from myself [i.e., on my own authority], but the Father Himself, who sent me, has ordered me what to say and speak.
Hebrews 2:2
For if the message spoken through angels proved to be binding [Note: This is a reference to the law of Moses. See Acts 7:53; Gal. 3:19], and every violation [of it] and disobedience [to it] received a just penalty,

But

John 3:11
Truly, truly, I tell you, we [i.e., Jesus and His disciples] speak about what we know, and testify about what we have seen, but you do not accept our testimony.