GOD'S WORD® Translation
I can guarantee this truth: We know what we're talking about, and we confirm what we've seen. Yet, you don't accept our message.

American Standard Version
Verily, verily, I say unto thee, We speak that which we know, and bear witness of that which we have seen; and ye receive not our witness.

Berean Study Bible
Truly, truly, I tell you, we speak of what we know, and we testify to what we have seen, and yet you people do not accept our testimony.

Douay-Rheims Bible
Amen, amen I say to thee, that we speak what we know, and we testify what we have seen, and you receive not our testimony.

English Revised Version
Verily, verily, I say unto thee, We speak that we do know, and bear witness of that we have seen; and ye receive not our witness.

King James Bible
Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness.

World English Bible
Most certainly I tell you, we speak that which we know, and testify of that which we have seen, and you don't receive our witness.

Young's Literal Translation
'Verily, verily, I say to thee -- What we have known we speak, and what we have seen we testify, and our testimony ye do not receive;

John 3:11 Additional Translations ...