John 12:47,48

‘If anyone hears my words and does not keep them, I do not judge him, for I did not come to judge the world but to save the world. He who rejects me and does not receive my words has a judge, the word that I have spoken will be his judge in the last day'.

Believing in Jesus also means hearing His words and ‘keeping' them, i.e. considering them carefully and living in accordance with them. ‘He who says I know Him and does not keep what He commanded is a liar and the truth is not in him' (1 John 2:4). Jesus will not judge such people now. He is intent on providing salvation for them. That is why He had come, to offer salvation to the world. But they will have a judge, for His very spoken word will act as their judge in the last day. (See John 3:17; John 5:24; John 5:45; John 8:15; John 8:31; John 8:37; John 8:51). The whole import of these verses is on the Saviour Who has come into the world and Whose word will be the final arbiter of men's destinies. He is both Messiah and Son of God.