Ezekiel 33:33

And when this comes about (see, it is coming), then it will be clear to them that a prophet has been among them.

Jeremiah 28:9

The prophet whose words are of peace, when his words come true, will be seen to be a prophet whom the Lord has sent.

Ezekiel 2:5

And they, if they give ear to you or if they do not give ear (for they are an uncontrolled people), will see that there has been a prophet among them.

1 Samuel 3:19-20

And Samuel became older, and the Lord was with him and let not one of his words be without effect.

2 Kings 5:8

Now Elisha, the man of God, hearing that the king of Israel had done this, sent to the king, saying, Why are you troubled? send the man to me, so that he may see that there is a prophet in Israel.

Ezekiel 33:29

Then they will be certain that I am the Lord, when I have made the land a waste and a cause of wonder, because of all the disgusting things which they have done,

Luke 10:11

Even the dust of your town, which is on our feet, we put off as a witness against you; but be certain of this, that the kingdom of God is near.

Treasury of Scripture Knowledge

Summary

And when this cometh to pass, (lo, it will come,) then shall they know that a prophet hath been among them.

General references

Bible References

When

1 Samuel 3:19
And Samuel became older, and the Lord was with him and let not one of his words be without effect.
Jeremiah 28:9
The prophet whose words are of peace, when his words come true, will be seen to be a prophet whom the Lord has sent.

Shall

Ezekiel 2:5
And they, if they give ear to you or if they do not give ear (for they are an uncontrolled people), will see that there has been a prophet among them.
2 Kings 5:8
Now Elisha, the man of God, hearing that the king of Israel had done this, sent to the king, saying, Why are you troubled? send the man to me, so that he may see that there is a prophet in Israel.
Luke 10:11
Even the dust of your town, which is on our feet, we put off as a witness against you; but be certain of this, that the kingdom of God is near.

General references

Ezekiel 12:15
And they will be certain that I am the Lord, when I send them in flight among the nations, driving them out through the countries.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain