I myself will guarantee his safety; you can hold me personally responsible for him. If I do not bring him back to you and set him here before you, I will bear the blame before you all my life.
NIV
I will be security for him; you shall require him of me [personally]; if I do not bring him back to you and put him before you, then let me bear the blame forever.
AMP
I will be surety for him; of my hand shalt thou require him: if I bring him not unto thee, and set him before thee, then let me bear the blame for ever:
KJV
"You can see for yourselves, and so can my brother Benjamin, that it is really I who am speaking to you."
NIV
Now notice! Your own eyes and the eyes of my brother Benjamin can see that I am talking to you personally [in your language and not through an interpreter].
AMP
And, behold, your eyes see, and the eyes of my brother Benjamin, that it is my mouth that speaketh unto you.
KJV