Yohana 21 : 24 John chapter 21 verse 24

Huyu ndiye yule mwanafunzi ayashuhudiaye haya, na aliyeyaandika haya: nasi twajua ya kuwa ushuhuda wake ni kweli.
soma Mlango wa 21

This is the disciple who testifies about these things, and wrote these things. We know that his witness is true.